NCERT Class 2 Maths (Joyful Mathematics) · Chapter 3
Fun with Numbers
Numbers up to 100 on a ginladi and number line, skip counting, counting backwards, and patterns in the number chart.
📌 What you’ll learn in this chapter
- Moving forward and backward on a number line
- Skip counting in 2s, 3s, 5s, and 10s
- Counting backwards
- Patterns in the 1–100 number chart
🐸 Let’s Begin: Jumpy the Frog
Jumpy the frog sits on 0. He jumps 2 steps each time: 2, 4, 6, 8, 10… That’s skip counting in 2s!
His big brother jumps 5 steps: 5, 10, 15, 20… They both land on 10 and 20!
➡️ Part 1: Forward and Backward
- Moving forward makes the number bigger: 23 → 3 steps forward → 26
- Moving backward makes it smaller: 23 → 3 steps back → 20
🦘 Part 2: Skip Counting
| Jump of | Numbers |
|---|---|
| 2 | 2, 4, 6, 8, 10, 12… |
| 5 | 5, 10, 15, 20, 25… |
| 10 | 10, 20, 30, 40… |
| 3 (from 1) | 1, 4, 7, 10, 13… |
🔢 Part 3: The Number Chart
- Going right adds 1, and going left takes away 1.
- Going down adds 10, and going up takes away 10.
💡 Number window
Around 28: above = 18, below = 38, left = 27, right = 29.
⚠️ Common mistake
Thinking the number after 39 is 310. ❌ After 39 comes 40.
✏️ Practice Time
Try these on your own first, then check your answer below each question.
Q1. Continue: 10, 20, 30, __, __
✅ Answer40, 50
Q2. What comes just before 60?
✅ Answer59
Q3. On the number chart, what is below 45?
✅ Answer55
📘 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!
Page 23 · Ginladi and number stripBeads and steps
✅ AnswerA ginladi usually has 100 beads (colour changes every 10). Blank cards: count the beads from 22 onwards to find each number. For the number strip, count the steps between each animal and the flower in your book.
Squirrel: −2 + 5 − 3 = back where it started (no change). Frog: +2 − 7 − 3 = 8 steps back from where it started.
Page 24 · Guess my placeSquirrel: −2 + 5 − 3 = back where it started (no change). Frog: +2 − 7 − 3 = 8 steps back from where it started.
Ants on the number line
✅ AnswerFind how much each small mark is worth between 20 and 80, then count to each ant. Mark 65 and 79 the same way (79 is just before 80).
Pages 25–27 · Patterns and skip countingJumps
✅ AnswerA. 1, 4, 7, 10, 13, 16, 19 · B. 40, 45, 50, 55, 60, 65, 70, 75 · C. 50, 60, 70, 80, 90
Common to 2s and 5s: 10, 20, 30 … 100 · Common to 2s, 3s, and 5s: 30, 60, 90 · Common to 5s and 7s: 35, 70
A. Yes B. Yes C. Yes D. No (4, 6, 8… are all even) E. No (13, 16, 19, 22, 25…)
Backwards: 40, 37, 34, 31, 28… · 70, 65, 60, 55, 50… · 100, 90, 80, 70… · 100, 80, 60, 40, 20… · 100, 90, 80, 70, 60 → 50, 40 (it has a pattern: 10 less each time)
Page 28 · Let us talkCommon to 2s and 5s: 10, 20, 30 … 100 · Common to 2s, 3s, and 5s: 30, 60, 90 · Common to 5s and 7s: 35, 70
A. Yes B. Yes C. Yes D. No (4, 6, 8… are all even) E. No (13, 16, 19, 22, 25…)
Backwards: 40, 37, 34, 31, 28… · 70, 65, 60, 55, 50… · 100, 90, 80, 70… · 100, 80, 60, 40, 20… · 100, 90, 80, 70, 60 → 50, 40 (it has a pattern: 10 less each time)
Counting questions
✅ AnswerA. No, 19 comes before 20. B. No, counting in 2s from 10 gives only even numbers. C. 20 steps. D. 10 steps.
Pages 29–31 · Number chart patternsBefore, windows, and blocks
✅ Answer9, 19, 29, 39 come just before 10, 20, 30, 40. The pattern continues: 49, 59, 69, 79, 89, 99.
Green numbers: 1, 12, 23, 34, 45, 56, 67, 78, 89, 100 (each is 11 more).
Window on 28: top 18, below 38, right 29, left 27. For 53: 43, 63, 52, 54 · 26: 16, 36, 25, 27 · 74: 64, 84, 73, 75.
Blocks: A. 1, 3, 6, 10, 15 · B. 1, 4, 9, 16, 25 · C. 5, 8, 11, 14
Green numbers: 1, 12, 23, 34, 45, 56, 67, 78, 89, 100 (each is 11 more).
Window on 28: top 18, below 38, right 29, left 27. For 53: 43, 63, 52, 54 · 26: 16, 36, 25, 27 · 74: 64, 84, 73, 75.
Blocks: A. 1, 3, 6, 10, 15 · B. 1, 4, 9, 16, 25 · C. 5, 8, 11, 14
👨👩👧 Tips for Parents
- Draw a number line on the floor and jump in 2s or 5s.
- Play “Guess my number” with yes/no questions.
- Count backwards from 20 during bath or bedtime.