Lesson 8.1: Numbers 21 to 99: Tens and Ones, Place Value & Comparison
Count up to 99, break numbers into tens and ones, and compare values.
⏱️ Reading Time: 15 mins
• ❓ 50 Interactive Practice Questions
#Numbers21to99 #TensAndOnes #ComparingNumbers
Numbers 21 to 99: Tens and Ones, Place Value & Comparing
Big numbers are built using bundles of TENS and single ONES. Understanding tens and ones helps us read and compare any 2-digit number up to 99!
10
10
10
3 Tens = 30
5 Ones = 5
Place Value Model: 3 Bundles of Ten (30) and 5 Ones (5) makes 35!
1. Bundles of Tens and Ones
In the number 35, there are 3 bundles of ten (30) and 5 single sticks (5). The digit on the left shows Tens; the digit on the right shows Ones: 3 Tens + 5 Ones = 35.
Examples: 42 = 4 Tens + 2 Ones; 70 = 7 Tens + 0 Ones; 89 = 8 Tens + 9 Ones.
2. Comparing Two Numbers (> and <)
To compare two numbers, first look at the Tens digit! The number with more Tens is greater. If Tens are equal, look at the Ones digit: 52 has 5 Tens, 38 has 3 Tens, so 52 is greater than 38 (52 > 38).
Alligator Mouth: The hungry alligator always opens its mouth toward the bigger number: 75 > 62!
💡 Key Learning Takeaways
- Two-digit numbers have a Tens place and a Ones place.
- Read tens as twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety.
- Compare tens first when deciding which number is greater.
🎯 Key Learning Takeaways
Master place value for numbers up to 99.
📄 Printable Worksheets (10 Available)
Download ready-to-print PDFs for offline student practice with separate parent/teacher answer keys.
WL-G1-C08-W10
A4 • 15 Qs
Numbers 21–99 — Worksheet 10
Curriculum Excellence & Final Review
WL-G1-C08-W09
A4 • 15 Qs
Numbers 21–99 — Worksheet 9
Mastery Assessment & Progress Check
WL-G1-C08-W08
A4 • 15 Qs
Numbers 21–99 — Worksheet 8
Mixed Review & Reinforcement
WL-G1-C08-W07
A4 • 15 Qs
Numbers 21–99 — Worksheet 7
Everyday Applications & Story Maths
WL-G1-C08-W06
A4 • 15 Qs
Numbers 21–99 — Worksheet 6
Critical Thinking & Deep Understanding
WL-G1-C08-W05
A4 • 15 Qs
Numbers 21–99 — Worksheet 5
Speed Challenge & Quick Check
WL-G1-C08-W04
A4 • 15 Qs
Numbers 21–99 — Worksheet 4
Problem Solving & Real-Life Stories
WL-G1-C08-W03
A4 • 15 Qs
Numbers 21–99 — Worksheet 3
Hands-on Visual Activity & Matching
WL-G1-C08-W02
A4 • 15 Qs
Numbers 21–99 — Worksheet 2
Essential Practice & Skill Builder
WL-G1-C08-W01
A4 • 15 Qs
Numbers 21–99 — Worksheet 1
Foundational Concepts & Visual Exploration
✍️ Lesson Practice Questions (50 Questions)
Solve these real-world challenges online, test your understanding, and reveal instant step-by-step explanations.
1
Multiple Choice
Hard
1 Mark
Farmer Dan has 14 sheep. Farmer Ben has 8 sheep. How many sheep must Dan give to Ben so they have different counts by 1?
A
1 sheep
B
None
C
All of them
D
Calculate difference
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1 sheep
Step-by-Step Explanation:
Adjusting by 1 changes the relative difference by 2.
2
Multiple Choice
Hard
1 Mark
I am a mystery number. If you add 8 to me, you get 22. Then if you subtract 2, what do you get?
A
12
B
8
C
16
D
14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
12
Step-by-Step Explanation:
The mystery number is 14. Subtracting 2 gives 12.
3
Multiple Choice
Hard
1 Mark
If 14 + 8 = 22, what is 8 + 14?
A
14
B
8
C
23
D
22
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
22
Step-by-Step Explanation:
Addition is commutative: changing the order of addends does not change the sum.
4
Multiple Choice
Hard
1 Mark
Why is 22 greater than 14?
A
Because adding 8 positive items increases the total amount
B
Because it ends with an odd digit
C
Because subtraction makes numbers bigger
D
Because order doesn't matter
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because adding 8 positive items increases the total amount
Step-by-Step Explanation:
Adding any non-zero positive number produces a larger total.
5
Multiple Choice
Medium
1 Mark
Sam claims: 'Taking away 8 from 22 gives 30.' What did Sam do wrong?
A
He counted backward
B
He added instead of subtracting
C
He forgot the tens
D
He divided the numbers
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
He added instead of subtracting
Step-by-Step Explanation:
Taking away means subtraction, but Sam performed addition.
6
Multiple Choice
Medium
1 Mark
A student said that 14 + 8 equals 32 because 'we always put 1 in front'. What mistake did the student make?
A
They subtracted instead
B
They forgot the decimal
C
The addition is correct
D
They confused adding numbers with writing digits side by side
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
They confused adding numbers with writing digits side by side
Step-by-Step Explanation:
Place values must be added together, not concatenated blindly.
7
Multiple Choice
Medium
1 Mark
What number completes the pattern: 14, 16, 18, [ ? ]?
A
20
B
22
C
21
D
19
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
20
Step-by-Step Explanation:
The pattern adds 2 each time. 18 + 2 = 20.
8
Multiple Choice
Medium
1 Mark
Find the missing number: 14 + [ ? ] = 22.
A
14
B
7
C
9
D
8
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
8
Step-by-Step Explanation:
Missing number is 8 because 14 + 8 = 22.
9
Multiple Choice
Medium
1 Mark
In a garden, there are 14 red butterflies and 8 blue butterflies. How many butterflies are fluttering together?
A
14 butterflies
B
8 butterflies
C
25 butterflies
D
22 butterflies
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
22 butterflies
Step-by-Step Explanation:
14 + 8 = 22 butterflies.
10
Multiple Choice
Medium
1 Mark
A school library table had 22 storybooks. Students checked out 8 books. How many books remain on the table?
A
8 books
B
14 books
C
13 books
D
15 books
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
14 books
Step-by-Step Explanation:
(22) - 8 = 14 books remain.
11
Multiple Choice
Medium
1 Mark
A baker made 14 blueberry muffins in the morning and 8 chocolate muffins in the afternoon. How many muffins did he bake in all?
A
14 muffins
B
21 muffins
C
22 muffins
D
24 muffins
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
22 muffins
Step-by-Step Explanation:
14 + 8 = 22 muffins baked.
12
Multiple Choice
Easy
1 Mark
What is the result of taking away 8 from 22?
A
13
B
14
C
15
D
8
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
14
Step-by-Step Explanation:
(22) - 8 = 14.
13
Multiple Choice
Easy
1 Mark
Compare the quantities: 19 [ ? ] 16.
A
>
B
<
C
=
D
≈
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
>
Step-by-Step Explanation:
19 is greater than 16.
14
Multiple Choice
Easy
1 Mark
Which number is 1 more than 22?
A
22
B
24
C
23
D
21
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
23
Step-by-Step Explanation:
Adding 1 gives 23.
15
Multiple Choice
Easy
1 Mark
In Chapter 'Numbers 21–99', what is 14 + 8?
A
24
B
21
C
23
D
22
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
22
Step-by-Step Explanation:
14 + 8 = 22.
16
Multiple Choice
Hard
1 Mark
Farmer Dan has 13 sheep. Farmer Ben has 5 sheep. How many sheep must Dan give to Ben so they have different counts by 1?
A
All of them
B
None
C
Calculate difference
D
1 sheep
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1 sheep
Step-by-Step Explanation:
Adjusting by 1 changes the relative difference by 2.
17
Multiple Choice
Hard
1 Mark
I am a mystery number. If you add 5 to me, you get 18. Then if you subtract 2, what do you get?
A
15
B
11
C
13
D
5
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
11
Step-by-Step Explanation:
The mystery number is 13. Subtracting 2 gives 11.
18
Multiple Choice
Hard
1 Mark
If 13 + 5 = 18, what is 5 + 13?
A
5
B
19
C
13
D
18
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
18
Step-by-Step Explanation:
Addition is commutative: changing the order of addends does not change the sum.
19
Multiple Choice
Hard
1 Mark
Why is 18 greater than 13?
A
Because it ends with an odd digit
B
Because adding 5 positive items increases the total amount
C
Because subtraction makes numbers bigger
D
Because order doesn't matter
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because adding 5 positive items increases the total amount
Step-by-Step Explanation:
Adding any non-zero positive number produces a larger total.
20
Multiple Choice
Medium
1 Mark
Sam claims: 'Taking away 5 from 18 gives 23.' What did Sam do wrong?
A
He forgot the tens
B
He divided the numbers
C
He added instead of subtracting
D
He counted backward
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
He added instead of subtracting
Step-by-Step Explanation:
Taking away means subtraction, but Sam performed addition.
21
Multiple Choice
Medium
1 Mark
A student said that 13 + 5 equals 28 because 'we always put 1 in front'. What mistake did the student make?
A
They confused adding numbers with writing digits side by side
B
They subtracted instead
C
The addition is correct
D
They forgot the decimal
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
They confused adding numbers with writing digits side by side
Step-by-Step Explanation:
Place values must be added together, not concatenated blindly.
22
Multiple Choice
Medium
1 Mark
What number completes the pattern: 13, 15, 17, [ ? ]?
A
20
B
21
C
18
D
19
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
19
Step-by-Step Explanation:
The pattern adds 2 each time. 17 + 2 = 19.
23
Multiple Choice
Medium
1 Mark
Find the missing number: 13 + [ ? ] = 18.
A
5
B
13
C
4
D
6
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
5
Step-by-Step Explanation:
Missing number is 5 because 13 + 5 = 18.
24
Multiple Choice
Medium
1 Mark
In a garden, there are 13 red butterflies and 5 blue butterflies. How many butterflies are fluttering together?
A
18 butterflies
B
5 butterflies
C
21 butterflies
D
13 butterflies
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
18 butterflies
Step-by-Step Explanation:
13 + 5 = 18 butterflies.
25
Multiple Choice
Medium
1 Mark
A school library table had 18 storybooks. Students checked out 5 books. How many books remain on the table?
A
12 books
B
5 books
C
14 books
D
13 books
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
13 books
Step-by-Step Explanation:
(18) - 5 = 13 books remain.
26
Multiple Choice
Medium
1 Mark
A baker made 13 blueberry muffins in the morning and 5 chocolate muffins in the afternoon. How many muffins did he bake in all?
A
17 muffins
B
20 muffins
C
18 muffins
D
13 muffins
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
18 muffins
Step-by-Step Explanation:
13 + 5 = 18 muffins baked.
27
Multiple Choice
Easy
1 Mark
What is the result of taking away 5 from 18?
A
14
B
12
C
13
D
5
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
13
Step-by-Step Explanation:
(18) - 5 = 13.
28
Multiple Choice
Easy
1 Mark
Compare the quantities: 18 [ ? ] 15.
A
=
B
>
C
<
D
≈
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
>
Step-by-Step Explanation:
18 is greater than 15.
29
Multiple Choice
Easy
1 Mark
Which number is 1 more than 18?
A
19
B
20
C
18
D
17
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
19
Step-by-Step Explanation:
Adding 1 gives 19.
30
Multiple Choice
Easy
1 Mark
In Chapter 'Numbers 21–99', what is 13 + 5?
A
17
B
19
C
18
D
20
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
18
Step-by-Step Explanation:
13 + 5 = 18.
31
Multiple Choice
Hard
1 Mark
Farmer Dan has 12 sheep. Farmer Ben has 2 sheep. How many sheep must Dan give to Ben so they have different counts by 1?
A
All of them
B
None
C
Calculate difference
D
1 sheep
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1 sheep
Step-by-Step Explanation:
Adjusting by 1 changes the relative difference by 2.
32
Multiple Choice
Hard
1 Mark
I am a mystery number. If you add 2 to me, you get 14. Then if you subtract 2, what do you get?
A
2
B
10
C
12
D
14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
10
Step-by-Step Explanation:
The mystery number is 12. Subtracting 2 gives 10.
33
Multiple Choice
Hard
1 Mark
If 12 + 2 = 14, what is 2 + 12?
A
2
B
12
C
15
D
14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
14
Step-by-Step Explanation:
Addition is commutative: changing the order of addends does not change the sum.
34
Multiple Choice
Hard
1 Mark
Why is 14 greater than 12?
A
Because order doesn't matter
B
Because adding 2 positive items increases the total amount
C
Because subtraction makes numbers bigger
D
Because it ends with an odd digit
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because adding 2 positive items increases the total amount
Step-by-Step Explanation:
Adding any non-zero positive number produces a larger total.
35
Multiple Choice
Medium
1 Mark
Sam claims: 'Taking away 2 from 14 gives 16.' What did Sam do wrong?
A
He counted backward
B
He added instead of subtracting
C
He divided the numbers
D
He forgot the tens
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
He added instead of subtracting
Step-by-Step Explanation:
Taking away means subtraction, but Sam performed addition.
36
Multiple Choice
Medium
1 Mark
A student said that 12 + 2 equals 24 because 'we always put 1 in front'. What mistake did the student make?
A
The addition is correct
B
They subtracted instead
C
They forgot the decimal
D
They confused adding numbers with writing digits side by side
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
They confused adding numbers with writing digits side by side
Step-by-Step Explanation:
Place values must be added together, not concatenated blindly.
37
Multiple Choice
Medium
1 Mark
What number completes the pattern: 12, 14, 16, [ ? ]?
A
17
B
18
C
19
D
20
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
18
Step-by-Step Explanation:
The pattern adds 2 each time. 16 + 2 = 18.
38
Multiple Choice
Medium
1 Mark
Find the missing number: 12 + [ ? ] = 14.
A
2
B
3
C
12
D
1
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
2
Step-by-Step Explanation:
Missing number is 2 because 12 + 2 = 14.
39
Multiple Choice
Medium
1 Mark
In a garden, there are 12 red butterflies and 2 blue butterflies. How many butterflies are fluttering together?
A
17 butterflies
B
12 butterflies
C
14 butterflies
D
2 butterflies
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
14 butterflies
Step-by-Step Explanation:
12 + 2 = 14 butterflies.
40
Multiple Choice
Medium
1 Mark
A school library table had 14 storybooks. Students checked out 2 books. How many books remain on the table?
A
11 books
B
13 books
C
2 books
D
12 books
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
12 books
Step-by-Step Explanation:
(14) - 2 = 12 books remain.
41
Multiple Choice
Medium
1 Mark
A baker made 12 blueberry muffins in the morning and 2 chocolate muffins in the afternoon. How many muffins did he bake in all?
A
12 muffins
B
14 muffins
C
16 muffins
D
13 muffins
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
14 muffins
Step-by-Step Explanation:
12 + 2 = 14 muffins baked.
42
Multiple Choice
Easy
1 Mark
What is the result of taking away 2 from 14?
A
2
B
12
C
11
D
13
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
12
Step-by-Step Explanation:
(14) - 2 = 12.
43
Multiple Choice
Easy
1 Mark
Compare the quantities: 17 [ ? ] 14.
A
>
B
=
C
<
D
≈
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
>
Step-by-Step Explanation:
17 is greater than 14.
44
Multiple Choice
Easy
1 Mark
Which number is 1 more than 14?
A
13
B
14
C
15
D
16
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
15
Step-by-Step Explanation:
Adding 1 gives 15.
45
Multiple Choice
Easy
1 Mark
In Chapter 'Numbers 21–99', what is 12 + 2?
A
13
B
15
C
16
D
14
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
14
Step-by-Step Explanation:
12 + 2 = 14.
46
Multiple Choice
Hard
1 Mark
Farmer Dan has 11 sheep. Farmer Ben has 7 sheep. How many sheep must Dan give to Ben so they have different counts by 1?
A
Calculate difference
B
1 sheep
C
All of them
D
None
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
1 sheep
Step-by-Step Explanation:
Adjusting by 1 changes the relative difference by 2.
47
Multiple Choice
Hard
1 Mark
I am a mystery number. If you add 7 to me, you get 18. Then if you subtract 2, what do you get?
A
9
B
7
C
13
D
11
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
9
Step-by-Step Explanation:
The mystery number is 11. Subtracting 2 gives 9.
48
Multiple Choice
Hard
1 Mark
If 11 + 7 = 18, what is 7 + 11?
A
7
B
11
C
18
D
19
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
18
Step-by-Step Explanation:
Addition is commutative: changing the order of addends does not change the sum.
49
Multiple Choice
Hard
1 Mark
Why is 18 greater than 11?
A
Because order doesn't matter
B
Because it ends with an odd digit
C
Because subtraction makes numbers bigger
D
Because adding 7 positive items increases the total amount
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
Because adding 7 positive items increases the total amount
Step-by-Step Explanation:
Adding any non-zero positive number produces a larger total.
50
Multiple Choice
Medium
1 Mark
Sam claims: 'Taking away 7 from 18 gives 25.' What did Sam do wrong?
A
He divided the numbers
B
He added instead of subtracting
C
He forgot the tens
D
He counted backward
💡 Click to View Correct Answer & Explanation ▼
Correct Answer:
He added instead of subtracting
Step-by-Step Explanation:
Taking away means subtraction, but Sam performed addition.