Chapter 11 of 13
Chapter 11: Numbers
Numbers 51 to 100, Sugarcane Bundles of 10 & 100-Chart | CBSE Session 2026–27
Core Pedagogical Competencies & Concepts
- Extending place value to numbers from 51 to 100.
- Grouping by 10s: 5 tens = 50 up to 10 tens = 100.
- Writing numerals and number names up to One Hundred.
- Completing missing numbers in the 51-100 grid.
All Textbook Exercises & In-Text Tasks (23 Questions)
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Q1
Textbook Exercise • 5 Bundles and 1 Stick
Write the number for 5 bundles of 10 matchsticks and 1 loose stick.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 5 tens + 1 one = 50 + 1 = 51 (Fifty-one).
• 5 tens + 1 one = 50 + 1 = 51 (Fifty-one).
CBSE Step-by-Step Marking Scheme
51 (Fifty-one)
2 M
Q2
Textbook Exercise • 6 Bundles and 5 Sticks
Write the number for 6 bundles of 10 and 5 loose sticks.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 6 tens + 5 ones = 60 + 5 = 65 (Sixty-five).
• 6 tens + 5 ones = 60 + 5 = 65 (Sixty-five).
CBSE Step-by-Step Marking Scheme
65 (Sixty-five)
2 M
Q3
Textbook Exercise • 7 Bundles and 3 Sticks
Write the number for 7 bundles of 10 and 3 loose sticks.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 7 tens + 3 ones = 70 + 3 = 73 (Seventy-three).
• 7 tens + 3 ones = 70 + 3 = 73 (Seventy-three).
CBSE Step-by-Step Marking Scheme
73 (Seventy-three)
2 M
Q4
Textbook Exercise • 8 Bundles and 8 Sticks
Write the number for 8 bundles of 10 and 8 loose sticks.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 8 tens + 8 ones = 80 + 8 = 88 (Eighty-eight).
• 8 tens + 8 ones = 80 + 8 = 88 (Eighty-eight).
CBSE Step-by-Step Marking Scheme
88 (Eighty-eight)
2 M
Q5
Textbook Exercise • 9 Bundles and 9 Sticks
Write the number for 9 bundles of 10 and 9 loose sticks. What is special about this number?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 9 tens + 9 ones = 99 (Ninety-nine).
• 99 is the largest 2-digit number.
• 9 tens + 9 ones = 99 (Ninety-nine).
• 99 is the largest 2-digit number.
CBSE Step-by-Step Marking Scheme
99 (Ninety-nine)
1 M
Largest 2-digit number
1 M
Q6
Textbook Exercise • 10 Bundles of 10
What number is formed by 10 bundles of 10 matchsticks?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 10 tens = 100 (One Hundred).
• 100 is the first 3-digit number.
• 10 tens = 100 (One Hundred).
• 100 is the first 3-digit number.
CBSE Step-by-Step Marking Scheme
100 (One Hundred)
1 M
First 3-digit number
1 M
Q7
Textbook Exercise • Missing Numbers 51 to 60
Fill the missing numbers: 51, 52, __, 54, __, 56, 57, __, 59, 60.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Missing numbers: 53, 55, 58.
• Missing numbers: 53, 55, 58.
CBSE Step-by-Step Marking Scheme
Filled 53, 55, 58
2 M
Q8
Textbook Exercise • Missing Numbers 61 to 70
Fill the missing numbers: 61, __, 63, 64, __, 66, __, 68, 69, 70.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Missing numbers: 62, 65, 67.
• Missing numbers: 62, 65, 67.
CBSE Step-by-Step Marking Scheme
Filled 62, 65, 67
2 M
Q9
Textbook Exercise • Missing Numbers 71 to 80
Fill the missing numbers: 71, 72, __, 74, __, 76, 77, __, 79, 80.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Missing numbers: 73, 75, 78.
• Missing numbers: 73, 75, 78.
CBSE Step-by-Step Marking Scheme
Filled 73, 75, 78
2 M
Q10
Textbook Exercise • Missing Numbers 81 to 90
Fill the missing numbers: 81, __, 83, 84, __, 86, __, 88, 89, 90.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Missing numbers: 82, 85, 87.
• Missing numbers: 82, 85, 87.
CBSE Step-by-Step Marking Scheme
Filled 82, 85, 87
2 M
Q11
Textbook Exercise • Missing Numbers 91 to 100
Fill the missing numbers: 91, 92, __, 94, __, 96, 97, __, 99, 100.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• Missing numbers: 93, 95, 98.
• Missing numbers: 93, 95, 98.
CBSE Step-by-Step Marking Scheme
Filled 93, 95, 98
2 M
Q12
Textbook Exercise • Tens and Ones for 64
Break 64 into Tens and Ones.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 64 = 6 Tens and 4 Ones.
• 64 = 6 Tens and 4 Ones.
CBSE Step-by-Step Marking Scheme
6 Tens and 4 Ones
2 M
Q13
Textbook Exercise • Tens and Ones for 89
Break 89 into Tens and Ones.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 89 = 8 Tens and 9 Ones.
• 89 = 8 Tens and 9 Ones.
CBSE Step-by-Step Marking Scheme
8 Tens and 9 Ones
2 M
Q14
Textbook Exercise • Number Names 60, 70, 80, 90
Write the spellings for: 60, 70, 80, 90.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 60 = Sixty
• 70 = Seventy
• 80 = Eighty
• 90 = Ninety
• 60 = Sixty
• 70 = Seventy
• 80 = Eighty
• 90 = Ninety
CBSE Step-by-Step Marking Scheme
All 4 spelled correctly
2 M
Q15
Textbook Exercise • What Comes Just After 79?
What number comes just after 79?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 79 + 1 = 80.
• 79 + 1 = 80.
CBSE Step-by-Step Marking Scheme
80
2 M
Q16
Textbook Exercise • What Comes Just Before 90?
What number comes just before 90?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 90 - 1 = 89.
• 90 - 1 = 89.
CBSE Step-by-Step Marking Scheme
89
2 M
Q17
Textbook Exercise • Between 65 and 67
What number lies between 65 and 67?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• The number is 66.
• The number is 66.
CBSE Step-by-Step Marking Scheme
66
2 M
Q18
Textbook Exercise • Circle Greater Number (50-100)
Circle the greater number: (a) 54 and 74, (b) 86 and 68.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• (a) 7 tens > 5 tens → 74 is greater.
• (b) 8 tens > 6 tens → 86 is greater.
• (a) 7 tens > 5 tens → 74 is greater.
• (b) 8 tens > 6 tens → 86 is greater.
CBSE Step-by-Step Marking Scheme
74 circled
1 M
86 circled
1 M
Q19
Word Problem • Marbles in Jars
A jar has 7 bundles of 10 marbles and 5 loose marbles. How many marbles in all?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 70 + 5 = 75 marbles.
• 70 + 5 = 75 marbles.
CBSE Step-by-Step Marking Scheme
70 + 5 = 75 marbles
2 M
Q20
Activity • Match 10s to Hundreds
Match: 10 tens → 100; 5 tens → 50; 8 tens → 80.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 10 tens = 100
• 5 tens = 50
• 8 tens = 80
• 10 tens = 100
• 5 tens = 50
• 8 tens = 80
CBSE Step-by-Step Marking Scheme
Matches verified
2 M
Q21
Mental Math • Adding 10 to 60
Solve: 60 + 10 = __.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 6 tens + 1 ten = 7 tens = 70.
• 6 tens + 1 ten = 7 tens = 70.
CBSE Step-by-Step Marking Scheme
70
2 M
Q22
Competency Review • Century in Cricket
In a cricket match, a player scores 100 runs. What is this score called?
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• A score of 100 runs is called a Century.
• A score of 100 runs is called a Century.
CBSE Step-by-Step Marking Scheme
Century
2 M
Q23
Summary Drill • Count by 10s to 100
Write the numbers counting in tens from 10 to 100.
[2 Marks]
✅ Step-by-Step Solution & Working
Step-by-Step Solution:
• 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
• 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
CBSE Step-by-Step Marking Scheme
Complete sequence in tens
2 M
🌟 NEP 2020 Competency-Based Case Study
Sugarcane Harvesting Case Study
Farmer Sham Lal ties sugarcane stalks into bundles of 10 stalks each. He has 6 full bundles and 4 loose stalks on his cart.
Analytical Task: How many sugarcane stalks does Sham Lal have in total? How many bundles will he have if he cuts 6 more stalks?
Evaluation & Model Answer:
1. 6 bundles of 10 = 60. Loose stalks = 4. Total = 60 + 4 = 64 sugarcane stalks.
2. With 6 more stalks, loose stalks = 4 + 6 = 10 (which makes 1 new bundle).
3. Total bundles = 6 + 1 = 7 full bundles of 10 (70 stalks).
2. With 6 more stalks, loose stalks = 4 + 6 = 10 (which makes 1 new bundle).
3. Total bundles = 6 + 1 = 7 full bundles of 10 (70 stalks).
Rubric: 1.5 M for 64 stalks + 1.5 M for 7 full bundles