NCERT Class 1 Maths (Joyful Mathematics) · Chapter 8
Fun with Numbers
Numbers from 21 to 100 using groups of ten, number names, ten frames, the ginladi, a snakes-and-ladders board, and Warli art.
📌 What you’ll learn in this chapter
- Counting in tens and ones up to 100
- Reading and writing number names (Twenty-one, Thirty-five…)
- Showing numbers with ten frames and bundles
- Finding missing numbers in a sequence
🥭 Let’s Begin: Mango Crates
Raju packs mangoes, 10 in each crate. He fills 3 crates and has 4 mangoes left over.
10, 20, 30… and 31, 32, 33, 34. That’s 34 mangoes, Thirty-four! 🥭
🔟 Part 1: Tens and Ones
| Groups of 10 | Extra ones | Number | Name |
|---|---|---|---|
| 2 | 1 | 21 | Twenty-one |
| 3 | 5 | 35 | Thirty-five |
| 4 | 7 | 47 | Forty-seven |
| 6 | 0 | 60 | Sixty |
| 10 | 0 | 100 | Hundred |
💡 Remember the tens
10 Ten · 20 Twenty · 30 Thirty · 40 Forty · 50 Fifty · 60 Sixty · 70 Seventy · 80 Eighty · 90 Ninety · 100 Hundred
⚠️ Common mistake
After 29, saying “twenty-ten”. ❌ After 29 comes 30 (thirty). After 39 comes 40, and so on.
✏️ Practice Time
Try these on your own first, then check your answer below each question.
Q1. 5 bundles of 10 sticks and 3 sticks. How many?
✅ Answer53
Q2. What comes after 69?
✅ Answer70
Q3. Write the number for “Eighty-two”.
✅ Answer82
📘 NCERT Textbook Activity Help
Hints and answers for the activities in the textbook, page by page. Try each one yourself before looking at the answer!
Pages 84–86 · Oranges, 21 to 30Simran’s boxes
✅ AnswerSimran fills 2 boxes (20 oranges) and has 3 loose oranges, so there are 23 oranges (a 3rd box is needed for the loose ones). Fill in: 23 Twenty-three · 25 Twenty-five · 26 Twenty-six · 29 Twenty-nine. Write 21 to 30 in order.
Pages 87–88 · 31 to 50Flowers and neem daatun
✅ AnswerMissing: 33 Thirty-three · 34 Thirty-four · 37 Thirty-seven · 38 Thirty-eight · 42 Forty-two · 44 Forty-four · 47 Forty-seven · 48 Forty-eight
Ginladi cards: count the beads up to each card (each colour group is 10).
Pages 89–90 · Count, tens frames, milestonesGinladi cards: count the beads up to each card (each colour group is 10).
Count and write
✅ AnswerFlowers: 4 garlands of 10 and 5 loose = 45 · Daatun: 4 bundles and 7 loose = 47 · Pencils: 3 pots of 10 and 2 = 32
Tens frames: 29 → 2 full frames + 9 (note: the book prints “Twenty one” here, but it should say Twenty-nine) · 41 → 4 full frames + 1 · 30 → 3 full frames
Milestones: fill the numbers in order from 34 to 46 along the road (35, 36, 37, 38, 40, 41, 43, 44, 45).
Pages 91–94 · 51 to 100Tens frames: 29 → 2 full frames + 9 (note: the book prints “Twenty one” here, but it should say Twenty-nine) · 41 → 4 full frames + 1 · 30 → 3 full frames
Milestones: fill the numbers in order from 34 to 46 along the road (35, 36, 37, 38, 40, 41, 43, 44, 45).
Number names
✅ AnswerFill each blank with the number or name that comes next, for example 53 Fifty-three, 55 Fifty-five, 63 Sixty-three, 76 Seventy-six, 82 Eighty-two, 98 Ninety-eight.
Page 95 · Count and snakes and laddersMissing numbers
✅ AnswerDaatun: 4 bundles + 7 = 47 · Ten frames: 8 full frames + 3 = 83 · Cubes: 6 towers of 10 + 6 = 66
Missing numbers on the board: 4, 7, 10, 14, 23, 26, 29, 35, 39, 44, 46, 47, 49, 55, 57, 60, 64, 67, 70, 75, 78, 85, 89, 91, 93, 94, 99
Pages 96–97 · Warli paintingMissing numbers on the board: 4, 7, 10, 14, 23, 26, 29, 35, 39, 44, 46, 47, 49, 55, 57, 60, 64, 67, 70, 75, 78, 85, 89, 91, 93, 94, 99
Let us talk
✅ AnswerC. 1 house · D. Count the stick-figure people carefully (about 10). E. Each palm leaf is drawn with many short straight lines. F. This is Warli painting. G. Warli art comes from Maharashtra (Western India).
👨👩👧 Tips for Parents
- Bundle ice-cream sticks into tens with rubber bands.
- Play snakes and ladders and say each number aloud.
- Ask, “What comes just after 49? Just before 80?”