Double Century
Numbers up to 200: the story of our numbers, making 100, bundles of tens, and number lines.
- How our number system uses just ten digits (0–9)
- What 100 is: 10 bundles of 10
- Different ways to make 100 (70 + 30, 65 + 35…)
- Reading, writing, and counting numbers from 100 to 200
- Placing numbers on a number line
🏏 Let’s Begin: A Century!
In a cricket match, Rohit scores 99 runs. The crowd is shouting! He hits one more run… 100! Everyone cheers: “A century!” 🎉
If a batter scores 200 runs, that’s a double century!
🔢 Part 1: Our Wonderful Numbers
Long ago, people counted with marks on walls. Then ancient Indians invented a way to write any number using only ten symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. The zero made this idea work!
💯 Part 2: What Is 100?
- One more than 99 is 100.
- 10 bundles of 10 sticks = 100 sticks.
- 10 packets of 10 bindis = 100 bindis.
Ways to make 100
| Number | + | Makes 100 |
|---|---|---|
| 70 | 30 | 100 |
| 65 | 35 | 100 |
| 45 | 55 | 100 |
| 91 | 9 | 100 |
🪵 Part 3: Numbers After 100
100 and 1 = 101 (one hundred one) · 100 and 25 = 125 (one hundred twenty-five) · 100 and 50 = 150
| Hundreds (bundle of 100) | Tens (bundles of 10) | Ones (loose sticks) | Number |
|---|---|---|---|
| 1 | 4 | 3 | 143 |
| 1 | 0 | 8 | 108 |
| 1 | 7 | 0 | 170 |
📏 Part 4: The Number Line
On a number line, numbers get bigger as you go right. 1 more than 159 is 160. 1 less than 160 is 159.
Jumps of 5: 100, 105, 110, 115, 120… · Jumps of 20: 100, 120, 140, 160, 180, 200
200 = 2 hundreds = 20 bundles of 10.
✏️ Practice Time
Try these on your own first, then check your answer below each question.
📘 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 16 · Mela pictureEstimate the objects
Missing numbers and questions
Q1–Q2: Follow the ladder up from 13, and the snake down from 25, to their other ends.
Q3: The top row goes 100 (END), 99, 98, 97… The snake’s mouth is at 99, so from 96 you need a 3.
Q4: Find the tail of the longest snake and show that number as bundles of 10 and loose sticks.
One more, and pairs to 100
Making 100: 60 and 40 makes 100 · 45 and 55 · 75 and 25 · 15 and 85 · other pairs like 50 + 50, 20 + 80
Flower petals: each petal pair must add up to 100. The partners are 25 → 75, 9 → 91, 81 → 19, 55 → 45, 60 → 40, 30 → 70, 37 → 63 (and so on for the rest).
Matchsticks and seeds: estimate, then count. For example, if a box has about 50 sticks, then 2 boxes are close to 100.
Bundles and number line
Bundles table: 1 hundred + tens + ones gives each number (e.g. 1, 0, 4 → 104 and 1, 2, 0 → 120). All the numbers start with 1 (one hundred).
Talking Pot: 127 → 128 · 105 → 106 · 109 → 110 · 150 → 151 · 134 → 135 · 100 → 101
Mark 125, 112, 149, and 137 by counting from the nearest ten.
Numbers 150 to 200
Stones in order: 150, 158, 163, 167, 177, 182, 189, 199
Jumps, 1 more and 1 less
1 less / 1 more: 159, 161 · 128, 130 · 186, 188 · 133, 135 · 157, 159
Making 125: 1 hundred + 2 tens + 5 ones, or 12 tens + 5 ones. 170 on the number line: 100 + 70, or 150 + 20.
Table: 172 = 1, 7, 2 = 100 and 72 · 30 more than 150 = 180 · 114 = 1, 1, 4 · 132 = 100 and 32 · 108 = 1, 0, 8 · 160 = 100 and 60
👨👩👧 Tips for Parents
- Make bundles of 10 with ice-cream sticks or straws, and show numbers up to 200.
- Play “Talking Pot”: you say a number, and your child says one more (or one less).
- Ask: “What goes with 45 to make 100?”