Lesson 11.2: Weighing, Comparing Objects, and Real-Life Mass Problems
Compare masses of multiple items, calculate heavier/lighter differences, and solve multi-step weighing word problems.
⏱️ Reading Time: 15 mins
• ❓ 50 Interactive Practice Questions
🌟
Real-Life Story: Weight and Mass
At an airport check-in desk, luggage must not exceed 23 kg. A traveler's suitcase weighs 19 kg 400 g. The airline attendant confirms the bag is within the limit, with 3 kg 600 g of remaining allowance.
💡 Core Mathematical Concepts: Comparing Masses & Real-Life Weighing
Focus areas: Heavier, lighter, difference in mass, luggage allowance, shipping packages.
| Concept / Term | Mathematical Definition | Everyday Example |
|---|---|---|
| Comparing Mass | Determining which object is heavier or lighter by subtracting their masses | A 1,200 g package is 400 g heavier than an 800 g package |
| Addition of Mass | Combine kilograms with kilograms and grams with grams; regroup 1,000 g as 1 kg when needed | 1 kg 600 g + 2 kg 500 g = 3 kg 1,100 g = 4 kg 100 g |
| Subtraction of Mass | Borrow 1 kg (1,000 g) from the kilograms column when grams cannot be subtracted directly | 5 kg 200 g - 2 kg 700 g = 4 kg 1,200 g - 2 kg 700 g = 2 kg 500 g |
| Net vs. Gross Mass | Gross mass is the total mass (contents + container); net mass is contents only | Cereal box: 450 g cereal + 50 g cardboard = 500 g total |
🔍 Practical Classroom & Everyday Examples
Example 1: Regrouping Across 1,000 Grams
Whenever grams exceed 1,000, convert each thousand grams into 1 whole kilogram.
Example 2: Zero Padding in Decimals
2 kg 50 g in decimal is 2.05 kg, NOT 2.5 kg (2.5 kg is 2 kg 500 g).
⚠️ Watch Out! Common Mistakes to Avoid
Common Error: Treating 1 kg as 100 g
Correction: Remember 1 kg is 1,000 g, NOT 100 g!
Common Error: Ignoring the mass of the empty container
Correction: In science experiments, tare (zero) the container before weighing liquids or powders.
🎯 Quick Self-Check Challenge
A crate of oranges weighs 12 kg 300 g. The empty wooden crate weighs 1 kg 800 g. What is the net mass of the oranges?
Answer & Explanation:
12 kg 300 g - 1 kg 800 g = 11 kg 1,300 g - 1 kg 800 g = 10 kg 500 g of oranges.
🎯 Key Learning Takeaways
Master Weight and Mass fundamentals.
📄 Printable Worksheets (5 Available)
Download ready-to-print PDFs for offline student practice with separate parent/teacher answer keys.
G3-M-CH11-WS05
A4 • 15 Qs
Weight and Mass — Worksheet 5
Grams, Kilograms & Scale Precision Calculations (Bakery Flour Warehouse)
G3-M-CH11-WS04
A4 • 15 Qs
Weight and Mass — Worksheet 4
Grams, Kilograms & Scale Precision Calculations (Science Chemistry Laboratory)
G3-M-CH11-WS03
A4 • 15 Qs
Weight and Mass — Worksheet 3
Grams, Kilograms & Scale Precision Calculations (Veterinary Clinic Pet Health)
G3-M-CH11-WS02
A4 • 15 Qs
Weight and Mass — Worksheet 2
Grams, Kilograms & Scale Precision Calculations (Supermarket Grocery Depot)
G3-M-CH11-WS01
A4 • 15 Qs
Weight and Mass — Worksheet 1
Grams, Kilograms & Scale Precision Calculations (Farmers Market Produce Stall)
✍️ Lesson Practice Questions (50 Questions)
Solve these real-world challenges online, test your understanding, and reveal instant step-by-step explanations.
1
Short Answer
Hard
2 Marks
A chef has three bags of sugar: Bag A weighs 2 kg 450 g, Bag B weighs 1 kg 800 g, and Bag C weighs 3 kg 150 g. What is the total combined mass of all three bags?
A
7 kg 400 g
B
6 kg 400 g
C
7 kg 300 g
D
7 kg 500 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7 kg 400 g
Step-by-Step Explanation:
Kg: 2 + 1 + 3 = 6 kg. Grams: 450 + 800 + 150 = 1,400 g = 1 kg 400 g. Total = 7 kg 400 g.
2
Short Answer
Hard
2 Marks
A delivery box containing 6 identical books has a total gross mass of 4 kg 500 g. The empty cardboard box weighs 300 g. What is the mass of ONE individual book?
A
700 grams
B
650 grams
C
750 grams
D
800 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
700 grams
Step-by-Step Explanation:
Net mass of 6 books = 4,500 g - 300 g = 4,200 g. Each book = 4,200 ÷ 6 = 700 grams.
3
Short Answer
Hard
2 Marks
If you cut a 1 kg block of cheese into 4 identical smaller blocks, what will be the exact mass of each smaller block?
A
250 grams
B
200 grams
C
500 grams
D
100 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
250 grams
Step-by-Step Explanation:
1 kg = 1,000 g. 1,000 g ÷ 4 = 250 grams per block.
4
Short Answer
Hard
2 Marks
Why is a balance scale with two equal arms considered one of the most reliable tools for comparing masses?
A
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
B
Because balance scales use electricity
C
Because balance scales only work in kitchens
D
Because springs stretch over time
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
Step-by-Step Explanation:
A balance scale compares unknown masses directly against standard masses using gravitational equilibrium.
5
Short Answer
Medium
1 Mark
Kevin subtracts: 4 kg 200 g - 1 kg 800 g and writes 3 kg 600 g because 800 - 200 = 600. What did Kevin do wrong?
A
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
B
He added instead of subtracting
C
He forgot to convert to kilograms
D
4 kg cannot be subtracted
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
Step-by-Step Explanation:
When the top gram value is smaller, borrow 1 kg (1,000 g): 3 kg 1,200 g - 1 kg 800 g = 2 kg 400 g.
6
Short Answer
Medium
1 Mark
A student writes: '3 kg 50 g is equal to 3,500 g.' What is the student's mistake?
A
3,500 g is 3 kg 500 g; 3 kg 50 g is actually 3,050 g
B
3 kg 50 g is 350 g
C
3 kg is 300 g
D
There is no error
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
3,500 g is 3 kg 500 g; 3 kg 50 g is actually 3,050 g
Step-by-Step Explanation:
50 grams has 0 hundreds, so 3,000 + 50 = 3,050 g, not 3,500 g.
7
Fill in the Blanks
Medium
1 Mark
Complete the balance scale: 1 kg weight = Two 250g weights + [ ? ] g
A
500 g
B
250 g
C
750 g
D
400 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
500 g
Step-by-Step Explanation:
Two 250 g weights = 500 g. 1,000 g - 500 g = 500 g.
8
Fill in the Blanks
Medium
1 Mark
Find the missing value: 2 kg 400 g + [ ? ] g = 3 kg
A
600 g
B
500 g
C
700 g
D
400 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
600 g
Step-by-Step Explanation:
3 kg = 3,000 g. 3,000 - 2,400 = 600 g.
9
Short Answer
Medium
1 Mark
A bag of flour weighs 5 kg. A baker uses 1,800 g for bread and 700 g for cakes. How many grams of flour remain?
A
2,500 g
B
2,300 g
C
2,700 g
D
3,000 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2,500 g
Step-by-Step Explanation:
5 kg = 5,000 g. Used: 1,800 + 700 = 2,500 g. Remaining: 5,000 - 2,500 = 2,500 g.
10
Short Answer
Medium
1 Mark
A baby panda weighed 3 kg 200 g at birth. After one month, it gained 1 kg 600 g. What was its new mass?
A
4 kg 800 g
B
4 kg 600 g
C
5 kg 000 g
D
4 kg 200 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
4 kg 800 g
Step-by-Step Explanation:
3 kg 200 g + 1 kg 600 g = 4 kg 800 g.
11
Short Answer
Medium
1 Mark
At the Bakery Flour Warehouse, an assistant packs 4 packages each weighing 350 grams. What is the combined mass of all 4 packages?
A
1400 g (1 kg 400 g)
B
1200 g
C
1900 g
D
700 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1400 g (1 kg 400 g)
Step-by-Step Explanation:
4 × 350 g = 1400 g.
12
Multiple Choice
Easy
1 Mark
A kitchen scale shows 1 kg 750 g. How many total grams is this?
A
1,750 g
B
175 g
C
1,075 g
D
17,500 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1,750 g
Step-by-Step Explanation:
1 kg = 1,000 g. 1,000 + 750 = 1,750 g.
13
Multiple Choice
Easy
1 Mark
Which object would most appropriately be weighed in grams (g) rather than kilograms (kg)?
A
A postage stamp
B
A family car
C
An adult horse
D
A washing machine
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
A postage stamp
Step-by-Step Explanation:
Light objects like postage stamps and feathers are weighed in grams.
14
Multiple Choice
Easy
1 Mark
Convert 1400 grams into kilograms and grams:
A
1 kg 400 g
B
14 kg
C
2 kg
D
0 kg 1400 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1 kg 400 g
Step-by-Step Explanation:
1400 g = 1 kg and 400 g.
15
Multiple Choice
Easy
1 Mark
How many grams are there in 5 kilograms?
A
5,000 g
B
500 g
C
50,000 g
D
50 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
5,000 g
Step-by-Step Explanation:
1 kg = 1,000 g. 5 × 1,000 = 5,000 g.
16
Short Answer
Hard
2 Marks
A chef has three bags of sugar: Bag A weighs 2 kg 450 g, Bag B weighs 1 kg 800 g, and Bag C weighs 3 kg 150 g. What is the total combined mass of all three bags?
A
7 kg 400 g
B
6 kg 400 g
C
7 kg 300 g
D
7 kg 500 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7 kg 400 g
Step-by-Step Explanation:
Kg: 2 + 1 + 3 = 6 kg. Grams: 450 + 800 + 150 = 1,400 g = 1 kg 400 g. Total = 7 kg 400 g.
17
Short Answer
Hard
2 Marks
A delivery box containing 6 identical books has a total gross mass of 4 kg 500 g. The empty cardboard box weighs 300 g. What is the mass of ONE individual book?
A
700 grams
B
650 grams
C
750 grams
D
800 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
700 grams
Step-by-Step Explanation:
Net mass of 6 books = 4,500 g - 300 g = 4,200 g. Each book = 4,200 ÷ 6 = 700 grams.
18
Short Answer
Hard
2 Marks
If you cut a 1 kg block of cheese into 4 identical smaller blocks, what will be the exact mass of each smaller block?
A
250 grams
B
200 grams
C
500 grams
D
100 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
250 grams
Step-by-Step Explanation:
1 kg = 1,000 g. 1,000 g ÷ 4 = 250 grams per block.
19
Short Answer
Hard
2 Marks
Why is a balance scale with two equal arms considered one of the most reliable tools for comparing masses?
A
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
B
Because balance scales use electricity
C
Because balance scales only work in kitchens
D
Because springs stretch over time
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
Step-by-Step Explanation:
A balance scale compares unknown masses directly against standard masses using gravitational equilibrium.
20
Short Answer
Medium
1 Mark
Kevin subtracts: 4 kg 200 g - 1 kg 800 g and writes 3 kg 600 g because 800 - 200 = 600. What did Kevin do wrong?
A
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
B
He added instead of subtracting
C
He forgot to convert to kilograms
D
4 kg cannot be subtracted
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
Step-by-Step Explanation:
When the top gram value is smaller, borrow 1 kg (1,000 g): 3 kg 1,200 g - 1 kg 800 g = 2 kg 400 g.
21
Short Answer
Medium
1 Mark
A student writes: '3 kg 50 g is equal to 3,500 g.' What is the student's mistake?
A
3,500 g is 3 kg 500 g; 3 kg 50 g is actually 3,050 g
B
3 kg 50 g is 350 g
C
3 kg is 300 g
D
There is no error
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
3,500 g is 3 kg 500 g; 3 kg 50 g is actually 3,050 g
Step-by-Step Explanation:
50 grams has 0 hundreds, so 3,000 + 50 = 3,050 g, not 3,500 g.
22
Fill in the Blanks
Medium
1 Mark
Complete the balance scale: 1 kg weight = Two 250g weights + [ ? ] g
A
500 g
B
250 g
C
750 g
D
400 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
500 g
Step-by-Step Explanation:
Two 250 g weights = 500 g. 1,000 g - 500 g = 500 g.
23
Fill in the Blanks
Medium
1 Mark
Find the missing value: 2 kg 400 g + [ ? ] g = 3 kg
A
600 g
B
500 g
C
700 g
D
400 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
600 g
Step-by-Step Explanation:
3 kg = 3,000 g. 3,000 - 2,400 = 600 g.
24
Short Answer
Medium
1 Mark
A bag of flour weighs 5 kg. A baker uses 1,800 g for bread and 700 g for cakes. How many grams of flour remain?
A
2,500 g
B
2,300 g
C
2,700 g
D
3,000 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2,500 g
Step-by-Step Explanation:
5 kg = 5,000 g. Used: 1,800 + 700 = 2,500 g. Remaining: 5,000 - 2,500 = 2,500 g.
25
Short Answer
Medium
1 Mark
A baby panda weighed 3 kg 200 g at birth. After one month, it gained 1 kg 600 g. What was its new mass?
A
4 kg 800 g
B
4 kg 600 g
C
5 kg 000 g
D
4 kg 200 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
4 kg 800 g
Step-by-Step Explanation:
3 kg 200 g + 1 kg 600 g = 4 kg 800 g.
26
Short Answer
Medium
1 Mark
At the Science Chemistry Laboratory, an assistant packs 5 packages each weighing 400 grams. What is the combined mass of all 5 packages?
A
2000 g (2 kg 0 g)
B
1800 g
C
2500 g
D
1000 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2000 g (2 kg 0 g)
Step-by-Step Explanation:
5 × 400 g = 2000 g.
27
Multiple Choice
Easy
1 Mark
A kitchen scale shows 1 kg 750 g. How many total grams is this?
A
1,750 g
B
175 g
C
1,075 g
D
17,500 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1,750 g
Step-by-Step Explanation:
1 kg = 1,000 g. 1,000 + 750 = 1,750 g.
28
Multiple Choice
Easy
1 Mark
Which object would most appropriately be weighed in grams (g) rather than kilograms (kg)?
A
A postage stamp
B
A family car
C
An adult horse
D
A washing machine
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
A postage stamp
Step-by-Step Explanation:
Light objects like postage stamps and feathers are weighed in grams.
29
Multiple Choice
Easy
1 Mark
Convert 2000 grams into kilograms and grams:
A
2 kg 0 g
B
20 kg
C
3 kg
D
0 kg 2000 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2 kg 0 g
Step-by-Step Explanation:
2000 g = 2 kg and 0 g.
30
Multiple Choice
Easy
1 Mark
How many grams are there in 5 kilograms?
A
5,000 g
B
500 g
C
50,000 g
D
50 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
5,000 g
Step-by-Step Explanation:
1 kg = 1,000 g. 5 × 1,000 = 5,000 g.
31
Short Answer
Hard
2 Marks
A chef has three bags of sugar: Bag A weighs 2 kg 450 g, Bag B weighs 1 kg 800 g, and Bag C weighs 3 kg 150 g. What is the total combined mass of all three bags?
A
7 kg 400 g
B
6 kg 400 g
C
7 kg 300 g
D
7 kg 500 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7 kg 400 g
Step-by-Step Explanation:
Kg: 2 + 1 + 3 = 6 kg. Grams: 450 + 800 + 150 = 1,400 g = 1 kg 400 g. Total = 7 kg 400 g.
32
Short Answer
Hard
2 Marks
A delivery box containing 6 identical books has a total gross mass of 4 kg 500 g. The empty cardboard box weighs 300 g. What is the mass of ONE individual book?
A
700 grams
B
650 grams
C
750 grams
D
800 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
700 grams
Step-by-Step Explanation:
Net mass of 6 books = 4,500 g - 300 g = 4,200 g. Each book = 4,200 ÷ 6 = 700 grams.
33
Short Answer
Hard
2 Marks
If you cut a 1 kg block of cheese into 4 identical smaller blocks, what will be the exact mass of each smaller block?
A
250 grams
B
200 grams
C
500 grams
D
100 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
250 grams
Step-by-Step Explanation:
1 kg = 1,000 g. 1,000 g ÷ 4 = 250 grams per block.
34
Short Answer
Hard
2 Marks
Why is a balance scale with two equal arms considered one of the most reliable tools for comparing masses?
A
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
B
Because balance scales use electricity
C
Because balance scales only work in kitchens
D
Because springs stretch over time
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
Step-by-Step Explanation:
A balance scale compares unknown masses directly against standard masses using gravitational equilibrium.
35
Short Answer
Medium
1 Mark
Kevin subtracts: 4 kg 200 g - 1 kg 800 g and writes 3 kg 600 g because 800 - 200 = 600. What did Kevin do wrong?
A
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
B
He added instead of subtracting
C
He forgot to convert to kilograms
D
4 kg cannot be subtracted
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
Step-by-Step Explanation:
When the top gram value is smaller, borrow 1 kg (1,000 g): 3 kg 1,200 g - 1 kg 800 g = 2 kg 400 g.
36
Short Answer
Medium
1 Mark
A student writes: '3 kg 50 g is equal to 3,500 g.' What is the student's mistake?
A
3,500 g is 3 kg 500 g; 3 kg 50 g is actually 3,050 g
B
3 kg 50 g is 350 g
C
3 kg is 300 g
D
There is no error
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
3,500 g is 3 kg 500 g; 3 kg 50 g is actually 3,050 g
Step-by-Step Explanation:
50 grams has 0 hundreds, so 3,000 + 50 = 3,050 g, not 3,500 g.
37
Fill in the Blanks
Medium
1 Mark
Complete the balance scale: 1 kg weight = Two 250g weights + [ ? ] g
A
500 g
B
250 g
C
750 g
D
400 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
500 g
Step-by-Step Explanation:
Two 250 g weights = 500 g. 1,000 g - 500 g = 500 g.
38
Fill in the Blanks
Medium
1 Mark
Find the missing value: 2 kg 400 g + [ ? ] g = 3 kg
A
600 g
B
500 g
C
700 g
D
400 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
600 g
Step-by-Step Explanation:
3 kg = 3,000 g. 3,000 - 2,400 = 600 g.
39
Short Answer
Medium
1 Mark
A bag of flour weighs 5 kg. A baker uses 1,800 g for bread and 700 g for cakes. How many grams of flour remain?
A
2,500 g
B
2,300 g
C
2,700 g
D
3,000 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2,500 g
Step-by-Step Explanation:
5 kg = 5,000 g. Used: 1,800 + 700 = 2,500 g. Remaining: 5,000 - 2,500 = 2,500 g.
40
Short Answer
Medium
1 Mark
A baby panda weighed 3 kg 200 g at birth. After one month, it gained 1 kg 600 g. What was its new mass?
A
4 kg 800 g
B
4 kg 600 g
C
5 kg 000 g
D
4 kg 200 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
4 kg 800 g
Step-by-Step Explanation:
3 kg 200 g + 1 kg 600 g = 4 kg 800 g.
41
Short Answer
Medium
1 Mark
At the Veterinary Clinic Pet Health, an assistant packs 3 packages each weighing 750 grams. What is the combined mass of all 3 packages?
A
2250 g (2 kg 250 g)
B
2050 g
C
2750 g
D
1125 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2250 g (2 kg 250 g)
Step-by-Step Explanation:
3 × 750 g = 2250 g.
42
Multiple Choice
Easy
1 Mark
A kitchen scale shows 1 kg 750 g. How many total grams is this?
A
1,750 g
B
175 g
C
1,075 g
D
17,500 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1,750 g
Step-by-Step Explanation:
1 kg = 1,000 g. 1,000 + 750 = 1,750 g.
43
Multiple Choice
Easy
1 Mark
Which object would most appropriately be weighed in grams (g) rather than kilograms (kg)?
A
A postage stamp
B
A family car
C
An adult horse
D
A washing machine
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
A postage stamp
Step-by-Step Explanation:
Light objects like postage stamps and feathers are weighed in grams.
44
Multiple Choice
Easy
1 Mark
Convert 2250 grams into kilograms and grams:
A
2 kg 250 g
B
22 kg
C
3 kg
D
0 kg 2250 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2 kg 250 g
Step-by-Step Explanation:
2250 g = 2 kg and 250 g.
45
Multiple Choice
Easy
1 Mark
How many grams are there in 5 kilograms?
A
5,000 g
B
500 g
C
50,000 g
D
50 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
5,000 g
Step-by-Step Explanation:
1 kg = 1,000 g. 5 × 1,000 = 5,000 g.
46
Short Answer
Hard
2 Marks
A chef has three bags of sugar: Bag A weighs 2 kg 450 g, Bag B weighs 1 kg 800 g, and Bag C weighs 3 kg 150 g. What is the total combined mass of all three bags?
A
7 kg 400 g
B
6 kg 400 g
C
7 kg 300 g
D
7 kg 500 g
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7 kg 400 g
Step-by-Step Explanation:
Kg: 2 + 1 + 3 = 6 kg. Grams: 450 + 800 + 150 = 1,400 g = 1 kg 400 g. Total = 7 kg 400 g.
47
Short Answer
Hard
2 Marks
A delivery box containing 6 identical books has a total gross mass of 4 kg 500 g. The empty cardboard box weighs 300 g. What is the mass of ONE individual book?
A
700 grams
B
650 grams
C
750 grams
D
800 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
700 grams
Step-by-Step Explanation:
Net mass of 6 books = 4,500 g - 300 g = 4,200 g. Each book = 4,200 ÷ 6 = 700 grams.
48
Short Answer
Hard
2 Marks
If you cut a 1 kg block of cheese into 4 identical smaller blocks, what will be the exact mass of each smaller block?
A
250 grams
B
200 grams
C
500 grams
D
100 grams
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
250 grams
Step-by-Step Explanation:
1 kg = 1,000 g. 1,000 g ÷ 4 = 250 grams per block.
49
Short Answer
Hard
2 Marks
Why is a balance scale with two equal arms considered one of the most reliable tools for comparing masses?
A
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
B
Because balance scales use electricity
C
Because balance scales only work in kitchens
D
Because springs stretch over time
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
When both sides balance horizontally, the downward gravitational force on both pans is identical, proving their masses are equal
Step-by-Step Explanation:
A balance scale compares unknown masses directly against standard masses using gravitational equilibrium.
50
Short Answer
Medium
1 Mark
Kevin subtracts: 4 kg 200 g - 1 kg 800 g and writes 3 kg 600 g because 800 - 200 = 600. What did Kevin do wrong?
A
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
B
He added instead of subtracting
C
He forgot to convert to kilograms
D
4 kg cannot be subtracted
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Kevin subtracted the smaller top number from the larger bottom number; he should borrow 1 kg (1,000 g) to make 1,200 g - 800 g = 400 g (Result: 2 kg 400 g)
Step-by-Step Explanation:
When the top gram value is smaller, borrow 1 kg (1,000 g): 3 kg 1,200 g - 1 kg 800 g = 2 kg 400 g.