Lesson 13.2: Multiplication Strategies: Times Tables, Distributive Property, and Word Problems
Master core tables (2, 3, 4, 5, 6, 8, 9, 10), break down large factors with the distributive property, and solve multi-step problems.
⏱️ Reading Time: 15 mins
• ❓ 50 Interactive Practice Questions
🌟
Real-Life Story: Multiplication
A warehouse manager packs 14 crates, each holding 6 glass jars. To multiply 14 × 6 mentally, she breaks 14 into 10 + 4: (10 × 6) + (4 × 6) = 60 + 24 = 84 jars. The distributive property makes mental calculations fast and error-free.
💡 Core Mathematical Concepts: Multiplication Strategies & Distributive Law
Focus areas: Times tables, doubling strategy, distributive property: 7×8 = (5×8)+(2×8).
| Concept / Term | Mathematical Definition | Everyday Example |
|---|---|---|
| Times Tables Mastery | Rapid recall of multiplication facts up to 10 × 10 | Foundation for mental arithmetic and division |
| Doubling Strategy | Multiplying by 4 is doubling twice (6 × 4 = double 6 is 12, double 12 is 24) | Multiplying by 8 is doubling three times |
| Distributive Property | Breaking a difficult factor into two easier addends and multiplying each separately | 7 × 6 = (5 × 6) + (2 × 6) = 30 + 12 = 42 |
| Skip Counting Patterns | Counting by 2s, 3s, 4s, 5s, 6s, 8s, 9s, 10s to find multiples rapidly | Multiples of 9: sum of digits always equals 9 (18, 27, 36, 45...) |
🔍 Practical Classroom & Everyday Examples
Example 1: Multiplying by 10 Shortcut
Place a zero at the end of the number: 38 × 10 = 380.
Example 2: The 9 Times Table Finger Trick
Hold up 10 fingers. To find 9 × 3, fold down the 3rd finger: 2 fingers on left, 7 on right = 27!
⚠️ Watch Out! Common Mistakes to Avoid
Common Error: Assuming multiplication always makes numbers bigger
Correction: Multiplying by 1 leaves the number unchanged; multiplying by 0 gives zero.
Common Error: Mixing up addition and multiplication in word problems
Correction: 'Has 4 books and gets 5 more' is 4+5=9. 'Has 4 bags with 5 books each' is 4×5=20.
🎯 Quick Self-Check Challenge
Use the distributive property to calculate 8 × 13 mentally.
Answer & Explanation:
Break 13 into 10 + 3: (8 × 10) + (8 × 3) = 80 + 24 = 104.
🎯 Key Learning Takeaways
Master Multiplication fundamentals.
📄 Printable Worksheets (5 Available)
Download ready-to-print PDFs for offline student practice with separate parent/teacher answer keys.
G3-M-CH13-WS05
A4 • 15 Qs
Multiplication — Worksheet 5
Arrays, Times Tables & Distributive Strategies (Bakery Muffin Baking Tins)
G3-M-CH13-WS04
A4 • 15 Qs
Multiplication — Worksheet 4
Arrays, Times Tables & Distributive Strategies (Orchard Apple Basket Packing)
G3-M-CH13-WS03
A4 • 15 Qs
Multiplication — Worksheet 3
Arrays, Times Tables & Distributive Strategies (Art School Watercolor Sets)
G3-M-CH13-WS02
A4 • 15 Qs
Multiplication — Worksheet 2
Arrays, Times Tables & Distributive Strategies (Robotics Circuit Board Sockets)
G3-M-CH13-WS01
A4 • 15 Qs
Multiplication — Worksheet 1
Arrays, Times Tables & Distributive Strategies (Greenhouse Seedling Trays)
✍️ 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
In a competition, 4 teams each have 6 players. Each player is given 3 bottles of water. How many bottles of water are handed out in total?
A
72 bottles
B
64 bottles
C
80 bottles
D
68 bottles
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
72 bottles
Step-by-Step Explanation:
Total players = 4 × 6 = 24 players. Total water = 24 × 3 = 72 bottles.
2
Short Answer
Hard
2 Marks
A farmer packs eggs into cartons of 12. If he fills 7 full cartons and has 5 eggs left over, how many eggs does he have in total?
A
89 eggs
B
84 eggs
C
92 eggs
D
87 eggs
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
89 eggs
Step-by-Step Explanation:
(7 × 12) + 5 = 84 + 5 = 89 eggs.
3
Short Answer
Hard
2 Marks
If you know that 10 × 7 = 70, how can you easily find 9 × 7 using mental math?
A
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
B
Add 7 to 70
C
Divide 70 by 9
D
Multiply 70 by 7
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
Step-by-Step Explanation:
9 × 7 is one group of 7 less than 10 × 7 (70 - 7 = 63).
4
Short Answer
Hard
2 Marks
Why can you calculate 6 × 8 by taking 3 × 8 and simply doubling the answer?
A
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
B
Because 8 is an even number
C
By coincidence only
D
Because 6 + 8 = 14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
Step-by-Step Explanation:
Doubling one factor doubles the resulting product: 6 × 8 = (2 × 3) × 8 = 2 × (3 × 8) = 2 × 24 = 48.
5
Short Answer
Medium
1 Mark
Dev solves 4 × 8 by doing 4 + 4 + 4 + 4 = 16. What was Dev's mistake?
A
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
B
Dev should have divided
C
4 × 8 is 12
D
There is no mistake
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
Step-by-Step Explanation:
4 × 8 means four groups of 8 (8 + 8 + 8 + 8 = 32) or eight groups of 4 (32).
6
Short Answer
Medium
1 Mark
A student says: '5 × 6 = 30, so 6 × 5 must be a different number because the order changed.' What is the student's misconception?
A
Multiplication is commutative (a × b = b × a); rotating an array shows 5 × 6 and 6 × 5 both equal 30
B
6 × 5 is equal to 35
C
Commutative property only applies to addition
D
5 × 6 is actually 25
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Multiplication is commutative (a × b = b × a); rotating an array shows 5 × 6 and 6 × 5 both equal 30
Step-by-Step Explanation:
The commutative property of multiplication guarantees that factor order does not change the product.
7
Fill in the Blanks
Medium
1 Mark
Complete the distributive breakdown: 7 × 12 = (7 × 10) + (7 × [ ? ])
A
2
B
3
C
4
D
5
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2
Step-by-Step Explanation:
12 = 10 + 2, so 7 × 12 = (7 × 10) + (7 × 2).
8
Fill in the Blanks
Medium
1 Mark
Find the missing factor: [ ? ] × 7 = 56
A
8
B
7
C
10
D
9
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
8
Step-by-Step Explanation:
56 ÷ 7 = 8.
9
Short Answer
Medium
1 Mark
A bicycle shop rents out 6 bicycles every hour. How many bicycles does it rent out in 8 hours?
A
48 bicycles
B
42 bicycles
C
54 bicycles
D
46 bicycles
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
48 bicycles
Step-by-Step Explanation:
6 × 8 = 48 bicycles.
10
Short Answer
Medium
1 Mark
A box holds 8 packs of crayons, and each pack contains 12 crayons. How many crayons are in the box?
A
96 crayons
B
84 crayons
C
92 crayons
D
100 crayons
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
96 crayons
Step-by-Step Explanation:
8 × 12 = 96 crayons.
11
Short Answer
Medium
1 Mark
At the Bakery Muffin Baking Tins, an organizer arranges items into 8 rows with 7 items in each row. How many items are there in total?
A
56 items
B
52 items
C
62 items
D
48 items
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
56 items
Step-by-Step Explanation:
8 rows × 7 items = 56 items.
12
Multiple Choice
Easy
1 Mark
Calculate: 24 × 10 =
A
240
B
204
C
24
D
2,400
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
240
Step-by-Step Explanation:
Multiplying by 10 shifts digits one place left: 24 × 10 = 240.
13
Multiple Choice
Easy
1 Mark
What is the product of 15 × 0?
A
0
B
15
C
1
D
150
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
0
Step-by-Step Explanation:
Any number multiplied by 0 equals 0.
14
Multiple Choice
Easy
1 Mark
Which addition sentence is EQUIVALENT to 4 × 7?
A
7 + 7 + 7 + 7
B
4 + 7
C
4 + 4 + 4 + 4
D
7 + 4 + 7 + 4
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7 + 7 + 7 + 7
Step-by-Step Explanation:
4 × 7 means 4 groups of 7 added together: 7 + 7 + 7 + 7 = 28.
15
Multiple Choice
Easy
1 Mark
Calculate: 8 × 7 =
A
56
B
54
C
60
D
48
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
56
Step-by-Step Explanation:
8 × 7 = 56.
16
Short Answer
Hard
2 Marks
In a competition, 4 teams each have 6 players. Each player is given 3 bottles of water. How many bottles of water are handed out in total?
A
72 bottles
B
64 bottles
C
80 bottles
D
68 bottles
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
72 bottles
Step-by-Step Explanation:
Total players = 4 × 6 = 24 players. Total water = 24 × 3 = 72 bottles.
17
Short Answer
Hard
2 Marks
A farmer packs eggs into cartons of 12. If he fills 7 full cartons and has 5 eggs left over, how many eggs does he have in total?
A
89 eggs
B
84 eggs
C
92 eggs
D
87 eggs
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
89 eggs
Step-by-Step Explanation:
(7 × 12) + 5 = 84 + 5 = 89 eggs.
18
Short Answer
Hard
2 Marks
If you know that 10 × 7 = 70, how can you easily find 9 × 7 using mental math?
A
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
B
Add 7 to 70
C
Divide 70 by 9
D
Multiply 70 by 7
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
Step-by-Step Explanation:
9 × 7 is one group of 7 less than 10 × 7 (70 - 7 = 63).
19
Short Answer
Hard
2 Marks
Why can you calculate 6 × 8 by taking 3 × 8 and simply doubling the answer?
A
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
B
Because 8 is an even number
C
By coincidence only
D
Because 6 + 8 = 14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
Step-by-Step Explanation:
Doubling one factor doubles the resulting product: 6 × 8 = (2 × 3) × 8 = 2 × (3 × 8) = 2 × 24 = 48.
20
Short Answer
Medium
1 Mark
Dev solves 4 × 8 by doing 4 + 4 + 4 + 4 = 16. What was Dev's mistake?
A
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
B
Dev should have divided
C
4 × 8 is 12
D
There is no mistake
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
Step-by-Step Explanation:
4 × 8 means four groups of 8 (8 + 8 + 8 + 8 = 32) or eight groups of 4 (32).
21
Short Answer
Medium
1 Mark
A student says: '5 × 6 = 30, so 6 × 5 must be a different number because the order changed.' What is the student's misconception?
A
Multiplication is commutative (a × b = b × a); rotating an array shows 5 × 6 and 6 × 5 both equal 30
B
6 × 5 is equal to 35
C
Commutative property only applies to addition
D
5 × 6 is actually 25
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Multiplication is commutative (a × b = b × a); rotating an array shows 5 × 6 and 6 × 5 both equal 30
Step-by-Step Explanation:
The commutative property of multiplication guarantees that factor order does not change the product.
22
Fill in the Blanks
Medium
1 Mark
Complete the distributive breakdown: 7 × 12 = (7 × 10) + (7 × [ ? ])
A
2
B
3
C
4
D
5
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2
Step-by-Step Explanation:
12 = 10 + 2, so 7 × 12 = (7 × 10) + (7 × 2).
23
Fill in the Blanks
Medium
1 Mark
Find the missing factor: [ ? ] × 6 = 54
A
9
B
8
C
11
D
10
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
9
Step-by-Step Explanation:
54 ÷ 6 = 9.
24
Short Answer
Medium
1 Mark
A bicycle shop rents out 6 bicycles every hour. How many bicycles does it rent out in 8 hours?
A
48 bicycles
B
42 bicycles
C
54 bicycles
D
46 bicycles
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
48 bicycles
Step-by-Step Explanation:
6 × 8 = 48 bicycles.
25
Short Answer
Medium
1 Mark
A box holds 8 packs of crayons, and each pack contains 12 crayons. How many crayons are in the box?
A
96 crayons
B
84 crayons
C
92 crayons
D
100 crayons
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
96 crayons
Step-by-Step Explanation:
8 × 12 = 96 crayons.
26
Short Answer
Medium
1 Mark
At the Orchard Apple Basket Packing, an organizer arranges items into 9 rows with 6 items in each row. How many items are there in total?
A
54 items
B
50 items
C
60 items
D
45 items
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
54 items
Step-by-Step Explanation:
9 rows × 6 items = 54 items.
27
Multiple Choice
Easy
1 Mark
Calculate: 24 × 10 =
A
240
B
204
C
24
D
2,400
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
240
Step-by-Step Explanation:
Multiplying by 10 shifts digits one place left: 24 × 10 = 240.
28
Multiple Choice
Easy
1 Mark
What is the product of 15 × 0?
A
0
B
15
C
1
D
150
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
0
Step-by-Step Explanation:
Any number multiplied by 0 equals 0.
29
Multiple Choice
Easy
1 Mark
Which addition sentence is EQUIVALENT to 4 × 7?
A
7 + 7 + 7 + 7
B
4 + 7
C
4 + 4 + 4 + 4
D
7 + 4 + 7 + 4
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7 + 7 + 7 + 7
Step-by-Step Explanation:
4 × 7 means 4 groups of 7 added together: 7 + 7 + 7 + 7 = 28.
30
Multiple Choice
Easy
1 Mark
Calculate: 9 × 6 =
A
54
B
52
C
58
D
45
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
54
Step-by-Step Explanation:
9 × 6 = 54.
31
Short Answer
Hard
2 Marks
In a competition, 4 teams each have 6 players. Each player is given 3 bottles of water. How many bottles of water are handed out in total?
A
72 bottles
B
64 bottles
C
80 bottles
D
68 bottles
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
72 bottles
Step-by-Step Explanation:
Total players = 4 × 6 = 24 players. Total water = 24 × 3 = 72 bottles.
32
Short Answer
Hard
2 Marks
A farmer packs eggs into cartons of 12. If he fills 7 full cartons and has 5 eggs left over, how many eggs does he have in total?
A
89 eggs
B
84 eggs
C
92 eggs
D
87 eggs
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
89 eggs
Step-by-Step Explanation:
(7 × 12) + 5 = 84 + 5 = 89 eggs.
33
Short Answer
Hard
2 Marks
If you know that 10 × 7 = 70, how can you easily find 9 × 7 using mental math?
A
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
B
Add 7 to 70
C
Divide 70 by 9
D
Multiply 70 by 7
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
Step-by-Step Explanation:
9 × 7 is one group of 7 less than 10 × 7 (70 - 7 = 63).
34
Short Answer
Hard
2 Marks
Why can you calculate 6 × 8 by taking 3 × 8 and simply doubling the answer?
A
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
B
Because 8 is an even number
C
By coincidence only
D
Because 6 + 8 = 14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
Step-by-Step Explanation:
Doubling one factor doubles the resulting product: 6 × 8 = (2 × 3) × 8 = 2 × (3 × 8) = 2 × 24 = 48.
35
Short Answer
Medium
1 Mark
Dev solves 4 × 8 by doing 4 + 4 + 4 + 4 = 16. What was Dev's mistake?
A
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
B
Dev should have divided
C
4 × 8 is 12
D
There is no mistake
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
Step-by-Step Explanation:
4 × 8 means four groups of 8 (8 + 8 + 8 + 8 = 32) or eight groups of 4 (32).
36
Short Answer
Medium
1 Mark
A student says: '5 × 6 = 30, so 6 × 5 must be a different number because the order changed.' What is the student's misconception?
A
Multiplication is commutative (a × b = b × a); rotating an array shows 5 × 6 and 6 × 5 both equal 30
B
6 × 5 is equal to 35
C
Commutative property only applies to addition
D
5 × 6 is actually 25
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Multiplication is commutative (a × b = b × a); rotating an array shows 5 × 6 and 6 × 5 both equal 30
Step-by-Step Explanation:
The commutative property of multiplication guarantees that factor order does not change the product.
37
Fill in the Blanks
Medium
1 Mark
Complete the distributive breakdown: 7 × 12 = (7 × 10) + (7 × [ ? ])
A
2
B
3
C
4
D
5
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2
Step-by-Step Explanation:
12 = 10 + 2, so 7 × 12 = (7 × 10) + (7 × 2).
38
Fill in the Blanks
Medium
1 Mark
Find the missing factor: [ ? ] × 5 = 35
A
7
B
6
C
9
D
8
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7
Step-by-Step Explanation:
35 ÷ 5 = 7.
39
Short Answer
Medium
1 Mark
A bicycle shop rents out 6 bicycles every hour. How many bicycles does it rent out in 8 hours?
A
48 bicycles
B
42 bicycles
C
54 bicycles
D
46 bicycles
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
48 bicycles
Step-by-Step Explanation:
6 × 8 = 48 bicycles.
40
Short Answer
Medium
1 Mark
A box holds 8 packs of crayons, and each pack contains 12 crayons. How many crayons are in the box?
A
96 crayons
B
84 crayons
C
92 crayons
D
100 crayons
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
96 crayons
Step-by-Step Explanation:
8 × 12 = 96 crayons.
41
Short Answer
Medium
1 Mark
At the Art School Watercolor Sets, an organizer arranges items into 7 rows with 5 items in each row. How many items are there in total?
A
35 items
B
31 items
C
41 items
D
28 items
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
35 items
Step-by-Step Explanation:
7 rows × 5 items = 35 items.
42
Multiple Choice
Easy
1 Mark
Calculate: 24 × 10 =
A
240
B
204
C
24
D
2,400
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
240
Step-by-Step Explanation:
Multiplying by 10 shifts digits one place left: 24 × 10 = 240.
43
Multiple Choice
Easy
1 Mark
What is the product of 15 × 0?
A
0
B
15
C
1
D
150
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
0
Step-by-Step Explanation:
Any number multiplied by 0 equals 0.
44
Multiple Choice
Easy
1 Mark
Which addition sentence is EQUIVALENT to 4 × 7?
A
7 + 7 + 7 + 7
B
4 + 7
C
4 + 4 + 4 + 4
D
7 + 4 + 7 + 4
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
7 + 7 + 7 + 7
Step-by-Step Explanation:
4 × 7 means 4 groups of 7 added together: 7 + 7 + 7 + 7 = 28.
45
Multiple Choice
Easy
1 Mark
Calculate: 7 × 5 =
A
35
B
33
C
39
D
28
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
35
Step-by-Step Explanation:
7 × 5 = 35.
46
Short Answer
Hard
2 Marks
In a competition, 4 teams each have 6 players. Each player is given 3 bottles of water. How many bottles of water are handed out in total?
A
72 bottles
B
64 bottles
C
80 bottles
D
68 bottles
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
72 bottles
Step-by-Step Explanation:
Total players = 4 × 6 = 24 players. Total water = 24 × 3 = 72 bottles.
47
Short Answer
Hard
2 Marks
A farmer packs eggs into cartons of 12. If he fills 7 full cartons and has 5 eggs left over, how many eggs does he have in total?
A
89 eggs
B
84 eggs
C
92 eggs
D
87 eggs
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
89 eggs
Step-by-Step Explanation:
(7 × 12) + 5 = 84 + 5 = 89 eggs.
48
Short Answer
Hard
2 Marks
If you know that 10 × 7 = 70, how can you easily find 9 × 7 using mental math?
A
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
B
Add 7 to 70
C
Divide 70 by 9
D
Multiply 70 by 7
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Subtract 7 from 70: 70 - 7 = 63 (9 groups of 7 is 1 group less than 10 groups of 7)
Step-by-Step Explanation:
9 × 7 is one group of 7 less than 10 × 7 (70 - 7 = 63).
49
Short Answer
Hard
2 Marks
Why can you calculate 6 × 8 by taking 3 × 8 and simply doubling the answer?
A
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
B
Because 8 is an even number
C
By coincidence only
D
Because 6 + 8 = 14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because 6 is double 3 (6 = 2 × 3), so 6 × 8 is double (3 × 8 = 24), which is 48
Step-by-Step Explanation:
Doubling one factor doubles the resulting product: 6 × 8 = (2 × 3) × 8 = 2 × (3 × 8) = 2 × 24 = 48.
50
Short Answer
Medium
1 Mark
Dev solves 4 × 8 by doing 4 + 4 + 4 + 4 = 16. What was Dev's mistake?
A
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
B
Dev should have divided
C
4 × 8 is 12
D
There is no mistake
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Dev added 4 four times instead of eight times (4 × 8 = 32), or he should have added 8 four times (8 + 8 + 8 + 8 = 32)
Step-by-Step Explanation:
4 × 8 means four groups of 8 (8 + 8 + 8 + 8 = 32) or eight groups of 4 (32).