Chapter 8 of 13
⬅️ Ch 7: Lina's Family Ch 9: Utsav ➡️
NCERT Class 1 Mathematics • New NEP 2020 / NCF-FS

Chapter 8: Fun with Numbers

Numbers 21 to 99, Matchstick Bundles of 10, Tens & Ones | CBSE Session 2026–27

Core Pedagogical Competencies & Concepts
  • Extending place value to two-digit numbers up to 99.
  • Grouping items into bundles of 10 and counting loose ones.
  • Writing numbers in expanded notation (e.g., 45 = 4 tens and 5 ones = 40 + 5).
  • Reading and completing the 1 to 100 number chart.
  • Comparing 2-digit numbers using tens place first, then ones place.
101010343 Tens + 4 Ones = 30 + 4 = 34

All Textbook Exercises & In-Text Tasks (22 Questions)

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Q1 Textbook Exercise • Counting Bundles of 10
Look at the picture: There are 2 bundles of 10 matchsticks and 4 loose matchsticks. What number is this?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 2 bundles of 10 = 20
• 4 loose sticks = 4
• Total = 20 + 4 = 24 (Twenty-four).
CBSE Step-by-Step Marking Scheme
20 + 4 = 24 1 M
Number name Twenty-four 1 M
Q2 Textbook Exercise • Tens and Ones Table
Write the Tens and Ones for: (a) 35, (b) 52, (c) 60, (d) 78.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) 35 = 3 Tens and 5 Ones
• (b) 52 = 5 Tens and 2 Ones
• (c) 60 = 6 Tens and 0 Ones
• (d) 78 = 7 Tens and 8 Ones
CBSE Step-by-Step Marking Scheme
All 4 correctly partitioned 2 M
Q3 Let Us Do • Making Bundles
How many bundles of 10 can you tie from 46 matchsticks? How many loose sticks will be left over?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• In 46, the tens digit is 4 and the ones digit is 6.
• Therefore, you can tie 4 complete bundles of 10.
• 6 loose sticks will be left over.
CBSE Step-by-Step Marking Scheme
4 bundles of 10 1 M
6 loose sticks left 1 M
Q4 Textbook Exercise • Number Strips 21 to 30
Fill the missing numbers on the strip: 21, 22, __, 24, __, 26, 27, __, 29, 30.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
Counting sequentially:
21, 22, 23, 24, 25, 26, 27, 28, 29, 30.
CBSE Step-by-Step Marking Scheme
Filled 23, 25, 28 correctly 2 M
Q5 Textbook Exercise • Number Strips 51 to 60
Write the numbers from 51 to 60 in correct order.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 51, 52, 53, 54, 55, 56, 57, 58, 59, 60.
CBSE Step-by-Step Marking Scheme
All 10 numbers in order 2 M
Q6 Let Us Think • Number Strips 91 to 100
Fill the missing numbers: 91, __, 93, 94, __, 96, __, 98, 99, 100.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 91, 92, 93, 94, 95, 96, 97, 98, 99, 100.
CBSE Step-by-Step Marking Scheme
Filled 92, 95, 97 accurately 2 M
Q7 Textbook Exercise • Expanded Form
Write in expanded form:
(a) 48 = __ + __
(b) 63 = __ + __
(c) 85 = __ + __
[3 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) 48 = 40 + 8
• (b) 63 = 60 + 3
• (c) 85 = 80 + 5
CBSE Step-by-Step Marking Scheme
40 + 8 1 M
60 + 3 1 M
80 + 5 1 M
Q8 Let Us Do • What Comes Before and After?
Write what comes:
(a) Just before 40
(b) Just after 69
(c) Between 88 and 90
[3 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) Just before 40 is 39.
• (b) Just after 69 is 70.
• (c) Between 88 and 90 is 89.
CBSE Step-by-Step Marking Scheme
Before 40 = 39 1 M
After 69 = 70 1 M
Between 88 & 90 = 89 1 M
Q9 Textbook Exercise • Comparing 2-Digit Numbers
Circle the greater number in each pair: (a) 42 and 24, (b) 67 and 76.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) 4 tens is greater than 2 tens → 42 is greater.
• (b) 7 tens is greater than 6 tens → 76 is greater.
CBSE Step-by-Step Marking Scheme
42 circled 1 M
76 circled 1 M
Q10 Let Us Think • Number Riddle
I have 5 tens and 3 ones. Who am I?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 5 tens = 50
• 3 ones = 3
• 50 + 3 = 53 (Fifty-three).
CBSE Step-by-Step Marking Scheme
Identified 53 1 M
Number name Fifty-three 1 M
Q11 Textbook Exercise • Counting in Tens
Write the sequence counting in tens from 10 to 100: 10, 20, 30, __, __, __, __, __, __, 100.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
CBSE Step-by-Step Marking Scheme
All tens filled correctly 2 M
Q12 Word Problem • Bindi Packets
A packet has 10 bindis. Suman buys 3 packets and has 4 loose bindis. How many bindis does Suman have in total?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 3 packets of 10 = 30 bindis
• Loose bindis = 4
• Total = 30 + 4 = 34 bindis.
CBSE Step-by-Step Marking Scheme
30 + 4 = 34 1 M
Answer with unit: 34 bindis 1 M
Q13 Let Us Do • Smallest 2-Digit Number
What is the smallest 2-digit number? What is the largest 2-digit number?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• The smallest 2-digit number is 10.
• The largest 2-digit number is 99.
CBSE Step-by-Step Marking Scheme
Smallest = 10 1 M
Largest = 99 1 M
Q14 Textbook Exercise • Circle the Smallest
Circle the smallest number among: 45, 19, 72, 33.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Comparing tens digits: 1 ten is smallest.
• Therefore, 19 is the smallest number.
CBSE Step-by-Step Marking Scheme
Identified 19 as smallest 2 M
Q15 Activity • Match Number to Bundles
Match: (1) 5 bundles and 2 sticks → 52. (2) 6 bundles and 9 sticks → 69.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 5 tens + 2 ones = 52
• 6 tens + 9 ones = 69
CBSE Step-by-Step Marking Scheme
Correct matches verified 2 M
Q16 Let Us Think • Adding 1 to 99
What number comes right after 99? How many digits does it have?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 99 + 1 = 100 (One Hundred).
• 100 has 3 digits (1 hundred, 0 tens, 0 ones).
CBSE Step-by-Step Marking Scheme
100 (One Hundred) 1 M
It has 3 digits 1 M
Q17 Textbook Exercise • Ascending Order
Arrange in order from smallest to biggest: 34, 12, 65, 48.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Comparing tens digits: 12 < 34 < 48 < 65.
• Ascending order: 12, 34, 48, 65.
CBSE Step-by-Step Marking Scheme
Correct order: 12, 34, 48, 65 2 M
Q18 Textbook Exercise • Descending Order
Arrange in order from biggest to smallest: 71, 95, 28, 50.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Comparing tens digits: 95 > 71 > 50 > 28.
• Descending order: 95, 71, 50, 28.
CBSE Step-by-Step Marking Scheme
Correct order: 95, 71, 50, 28 2 M
Q19 Word Problem • Beads on a String
Grandma made 4 necklaces of 10 pearls each. She has 9 extra loose pearls. How many pearls does she have in all?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 4 necklaces = 40 pearls
• Loose pearls = 9
• Total = 40 + 9 = 49 pearls.
CBSE Step-by-Step Marking Scheme
40 + 9 = 49 1 M
Answer: 49 pearls 1 M
Q20 Mental Math • Same Digits
Write any two numbers where the tens digit and the ones digit are exactly the same (e.g. 11).
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Examples: 22, 33, 44, 55, 66, 77, 88, 99.
• Any two of these are correct.
CBSE Step-by-Step Marking Scheme
Two valid double-digit numbers 2 M
Q21 Let Us Do • Tens Strip Jump
If you are at 37 on the 100-chart and you jump down 1 box (add 10), what number do you reach?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 37 + 10 = 47.
• Jumping down one row in a 100-grid always increases the number by 1 ten (10).
CBSE Step-by-Step Marking Scheme
Reaches 47 1 M
Explains adding 10 1 M
Q22 Competency Review • Making Tens from Loose Sticks
Aman has 28 loose sticks. How many bundles of 10 can he make, and how many sticks will remain?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 28 = 20 + 8 = 2 tens and 8 ones.
• Aman can make 2 bundles of 10, and 8 sticks will remain.
CBSE Step-by-Step Marking Scheme
2 bundles of 10 1 M
8 sticks remain 1 M
🌟 NEP 2020 Competency-Based Case Study

Flower Garlands at the Temple Case Study

Meena stringed 3 garlands of 10 marigold flowers each, and she has 7 loose flowers remaining in her basket.

Analytical Task: How many total flowers does Meena have? How many more loose flowers does she need to complete a fourth garland of 10?
Evaluation & Model Answer:
1. 3 garlands of 10 = 30 flowers. Loose flowers = 7. Total = 30 + 7 = 37 flowers.
2. To make a full garland of 10 from 7 flowers, she needs: 10 - 7 = 3 more flowers.
Rubric: 1.5 M for 30 + 7 = 37 flowers + 1.5 M for 10 - 7 = 3 flowers
⬅️ Ch 7: Lina's Family Ch 9: Utsav ➡️