Chapter 5 of 13
Chapter 5: Numbers from Ten to Twenty
Bundles of 10, Counting 10-20, Tens and Ones, Addition & Subtraction | CBSE Session 2026–27
Core Pedagogical Competencies & Concepts
- Making groups of 10 from loose objects (matchsticks, pencils).
- Counting from 10 to 20: 10 + 1 = 11 up to 10 + 10 = 20.
- Partitioning numbers into Tens and Ones.
- Comparing numbers from 10 to 20: greater than and smaller than.
- Addition and subtraction within 20.
All Textbook Exercises & In-Text Tasks (24 Questions)
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Q1
Textbook Exercise • Bundle of 10 Matchsticks
How many loose matchsticks make 1 bundle of 10? What do we call 10 ones?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Exactly 10 loose matchsticks tied together make 1 bundle.
• 10 ones is called 1 Ten.
• Exactly 10 loose matchsticks tied together make 1 bundle.
• 10 ones is called 1 Ten.
CBSE Step-by-Step Marking Scheme
10 loose matchsticks
1 M
10 ones = 1 Ten
1 M
Q2
Textbook Exercise • Make a Group of 10
Look at 14 ice-cream cups. Circle a group of 10 cups. How many cups remain uncircled?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Total cups = 14
• Circled group = 10 (1 ten)
• Uncircled cups = 14 - 10 = 4 cups.
• Total cups = 14
• Circled group = 10 (1 ten)
• Uncircled cups = 14 - 10 = 4 cups.
CBSE Step-by-Step Marking Scheme
Group of 10 circled
1 M
4 remaining
1 M
Q3
Textbook Exercise • Counting 10 to 15
Write the numbers from 10 to 15 in order with their number names.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 10 = Ten
• 11 = Eleven
• 12 = Twelve
• 13 = Thirteen
• 14 = Fourteen
• 15 = Fifteen
• 10 = Ten
• 11 = Eleven
• 12 = Twelve
• 13 = Thirteen
• 14 = Fourteen
• 15 = Fifteen
CBSE Step-by-Step Marking Scheme
All 6 numerals & names correct
2 M
Q4
Textbook Exercise • Counting 16 to 20
Write the numbers from 16 to 20 in order with their number names.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 16 = Sixteen
• 17 = Seventeen
• 18 = Eighteen
• 19 = Nineteen
• 20 = Twenty
• 16 = Sixteen
• 17 = Seventeen
• 18 = Eighteen
• 19 = Nineteen
• 20 = Twenty
CBSE Step-by-Step Marking Scheme
All 5 numerals & names correct
2 M
Q5
Textbook Exercise • Tens and Ones for 18
In the number 18, how many tens and how many ones are there?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• In 18, there is 1 Ten and 8 Ones (10 + 8 = 18).
• In 18, there is 1 Ten and 8 Ones (10 + 8 = 18).
CBSE Step-by-Step Marking Scheme
1 Ten and 8 Ones
2 M
Q6
Textbook Exercise • Tens and Ones for 15
Write Tens and Ones for 15.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 15 = 1 Ten and 5 Ones (10 + 5 = 15).
• 15 = 1 Ten and 5 Ones (10 + 5 = 15).
CBSE Step-by-Step Marking Scheme
1 Ten and 5 Ones
2 M
Q7
Textbook Exercise • Tens and Ones for 12
Write Tens and Ones for 12.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 12 = 1 Ten and 2 Ones.
• 12 = 1 Ten and 2 Ones.
CBSE Step-by-Step Marking Scheme
1 Ten and 2 Ones
2 M
Q8
Textbook Exercise • Tens and Ones for 20
How many tens and how many ones make 20?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 20 = 2 Tens and 0 Ones (10 + 10 = 20).
• 20 = 2 Tens and 0 Ones (10 + 10 = 20).
CBSE Step-by-Step Marking Scheme
2 Tens and 0 Ones
2 M
Q9
Textbook Exercise • Circle the Bigger Number (Teens)
Circle the bigger number: (a) 11 and 13, (b) 16 and 14.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) 13 is bigger than 11 → Circle 13.
• (b) 16 is bigger than 14 → Circle 16.
• (a) 13 is bigger than 11 → Circle 13.
• (b) 16 is bigger than 14 → Circle 16.
CBSE Step-by-Step Marking Scheme
13 circled
1 M
16 circled
1 M
Q10
Textbook Exercise • Circle the Smaller Number (Teens)
Circle the smaller number: (a) 20 and 10, (b) 12 and 17.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) 10 is smaller than 20 → Circle 10.
• (b) 12 is smaller than 17 → Circle 12.
• (a) 10 is smaller than 20 → Circle 10.
• (b) 12 is smaller than 17 → Circle 12.
CBSE Step-by-Step Marking Scheme
10 circled
1 M
12 circled
1 M
Q11
Textbook Exercise • Biggest Number Among Three
Circle the biggest number among: 13, 3, 9.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 13 is a 2-digit teen number (1 ten and 3 ones).
• 3 and 9 are 1-digit numbers.
• 13 is the biggest number.
• 13 is a 2-digit teen number (1 ten and 3 ones).
• 3 and 9 are 1-digit numbers.
• 13 is the biggest number.
CBSE Step-by-Step Marking Scheme
13 is biggest
2 M
Q12
Textbook Exercise • Smallest Number Among Three
Circle the smallest number among: 12, 15, 20.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Comparing: 12 < 15 < 20.
• 12 is the smallest number.
• Comparing: 12 < 15 < 20.
• 12 is the smallest number.
CBSE Step-by-Step Marking Scheme
12 is smallest
2 M
Q13
Textbook Exercise • Addition within 20 (4 + 5)
Solve: 4 + 5 = __ and 14 + 5 = __.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 4 + 5 = 9
• 14 + 5 = 10 + (4 + 5) = 10 + 9 = 19.
• 4 + 5 = 9
• 14 + 5 = 10 + (4 + 5) = 10 + 9 = 19.
CBSE Step-by-Step Marking Scheme
4+5 = 9
1 M
14+5 = 19
1 M
Q14
Textbook Exercise • Addition 8 + 7
Solve: 8 + 7 = __ using the 'Make 10' method.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
1. 8 needs 2 to make 10.
2. 7 = 2 + 5.
3. 8 + 2 = 10.
4. 10 + 5 = 15.
1. 8 needs 2 to make 10.
2. 7 = 2 + 5.
3. 8 + 2 = 10.
4. 10 + 5 = 15.
CBSE Step-by-Step Marking Scheme
Make 10 steps shown
1 M
Answer: 15
1 M
Q15
Textbook Exercise • Addition 11 + 5
Add:
11
+ 5
---
[2 Marks]
11
+ 5
---
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
11
+ 5
---
16
11
+ 5
---
16
CBSE Step-by-Step Marking Scheme
Answer 16
2 M
Q16
Textbook Exercise • Subtraction 17 - 5
Subtract:
17
- 5
---
[2 Marks]
17
- 5
---
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
17
- 5
---
12 (7 - 5 = 2, bring down 1 ten).
17
- 5
---
12 (7 - 5 = 2, bring down 1 ten).
CBSE Step-by-Step Marking Scheme
Answer 12
2 M
Q17
Textbook Exercise • Subtraction 18 - 8
Solve: 18 - 8 = __.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 18 = 10 + 8.
• Subtracting 8 leaves 10.
• 18 = 10 + 8.
• Subtracting 8 leaves 10.
CBSE Step-by-Step Marking Scheme
Answer 10
2 M
Q18
Textbook Exercise • Subtraction 15 - 3
Solve: 15 - 3 = __.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 5 - 3 = 2.
• 10 + 2 = 12.
• 5 - 3 = 2.
• 10 + 2 = 12.
CBSE Step-by-Step Marking Scheme
Answer 12
2 M
Q19
Word Problem • Rahul's Apples
Rahul has 8 apples. Sonu gave him 7 more apples. How many apples does Rahul have now?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 8 + 7 = 15 apples.
• 8 + 7 = 15 apples.
CBSE Step-by-Step Marking Scheme
8 + 7 = 15 apples
2 M
Q20
Word Problem • Sohan's Bananas
Sohan had 12 bananas. He ate 4 bananas. How many bananas are left?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 12 - 4 = 8 bananas left.
• 12 - 4 = 8 bananas left.
CBSE Step-by-Step Marking Scheme
12 - 4 = 8 bananas
2 M
Q21
Textbook Exercise • What Comes Just After 18?
What number comes just before 13? What number comes just after 18?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Just before 13 is 12.
• Just after 18 is 19.
• Just before 13 is 12.
• Just after 18 is 19.
CBSE Step-by-Step Marking Scheme
Before 13 = 12
1 M
After 18 = 19
1 M
Q22
Textbook Exercise • Between 14 and 16
What number lies between 14 and 16?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• The number between 14 and 16 is 15.
• The number between 14 and 16 is 15.
CBSE Step-by-Step Marking Scheme
15
2 M
Q23
Activity • Match Numeral to Sticks
Match: (1) 1 bundle of 10 and 6 sticks → 16. (2) 1 bundle of 10 and 9 sticks → 19.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 10 + 6 = 16
• 10 + 9 = 19
• 10 + 6 = 16
• 10 + 9 = 19
CBSE Step-by-Step Marking Scheme
Matches verified
2 M
Q24
Competency Review • Making 20
How many ones must be added to 14 to make 20?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 20 - 14 = 6 ones.
• 20 - 14 = 6 ones.
CBSE Step-by-Step Marking Scheme
6 ones
2 M
🌟 NEP 2020 Competency-Based Case Study
Matchstick Bundling Project Case Study
Deepak has 14 loose matchsticks on his work table. His teacher asks him to make a bundle of 10 matchsticks using a red rubber band.
Analytical Task: How many bundles of 10 can Deepak make? How many loose matchsticks will remain outside the bundle?
Evaluation & Model Answer:
1. 14 has 1 ten and 4 ones.
2. Deepak can make 1 bundle of 10 matchsticks.
3. 4 loose matchsticks will remain outside.
2. Deepak can make 1 bundle of 10 matchsticks.
3. 4 loose matchsticks will remain outside.
Rubric: 1.5 M for 1 bundle of 10 + 1.5 M for 4 loose sticks