Summary
Chapter 3 of the Class 3 Maths NCERT textbook (Maths Mela), "Double Century", teaches children to understand, read, and write numbers from 100 up to 200 using bundles and sticks, number lines, and number sentences, while also introducing the history of how ancient Indians invented our ten-symbol number system.
- How Our Number System Began — Thousands of years ago, ancient Indians created a way to write any number using just ten symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. The symbol 0 was especially important because it represents nothing and makes the whole system work.
- Understanding 100 — One hundred is the same as 10 bundles of 10 sticks each. The chapter uses familiar everyday objects — packets of bindis, strings of beads, and matchstick bundles — to help children picture what 100 really means.
- Numbers from 101 to 200 — Children learn to build numbers beyond 100 by adding to 100, for example 100 and 5 makes 105, or One Hundred Five. They practice reading and writing number names all the way up to 200, which is called Two Hundred or a Double Century.
- Number Lines and Jumping Games — The chapter uses number lines to count from 100 to 200, including jumps of 5 and jumps of 20. Activities like filling missing numbers and marking positions on a number line help children see the order and pattern of these numbers.
Key points & formulas
- 01Ancient Indians invented a number system using ten symbols (0–9) that is now used all over the world.
- 02The symbol 0, meaning nothing, is what makes the entire number system work.
- 03100 equals 10 bundles of 10 sticks; this idea of grouping helps children count and understand large numbers.
- 04Numbers from 101 to 200 are formed by adding to 100, for example 100 and 7 makes 107 (One Hundred Seven).
- 05200, called a Double Century, is built up step by step through the chapter using tables, number lines, and activities.
- 06Children practice finding 1 more and 1 less than numbers between 100 and 200.
- 07Activities like Clap, Snap and Pat use body movements where one clap means 100, one snap means 10, and one pat means 1 to represent three-digit numbers.
Frequently asked questions
01What does the title Double Century mean?
Double Century means 200, which is double of 100 (a century). The chapter takes children step by step from 100 all the way up to 200.
02Who invented the number symbols we use today?
Thousands of years ago, ancient Indians invented a method to write any number using only ten symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. This invention is now used everywhere in the world and made technology like computers and mobile phones possible.
03Why is the number 0 so important?
The number 0 represents nothing or the absence of something. The chapter explains that it was the introduction of 0 that really made the ten-symbol number system work properly.
04How does the chapter explain what 100 looks like?
The chapter shows that 100 is the same as 10 bundles of 10 sticks each. It also gives examples like 10 packets of 10 bindis and a string of 100 beads to help children visualise the quantity.
05How do children learn to write numbers beyond 100?
Children learn by starting with 100 and adding more: 100 and 2 makes 102 (One Hundred Two), 100 and 10 makes 110 (One Hundred Ten), and so on. They fill in tables that show the number, the number sentence, and the number name side by side.
06What is the Talking Pot activity in this chapter?
The Talking Pot is a fun activity where a pot says one more than whatever number you tell it. For example, if you say 99, the pot says 100. If you say 127, the pot says 128. This helps children practice the concept of one more within the range 100 to 200.
07What is the Clap, Snap and Pat game?
In this game, one clap stands for 100, one snap stands for 10, and one pat stands for 1. Teams take turns showing a number using these actions and the other team guesses the number. For example, Clap — Snap Snap — Pat Pat Pat means 123.
08How do children use number lines in this chapter?
Children use number lines to count and place numbers from 100 to 200. They do jumping exercises — drawing jumps of 5 or jumps of 20 — and mark specific numbers using arrows, trees, smileys, and crosses to practise their position in order.
09What pairs of numbers make 100 in this chapter?
The chapter shows many pairs: 70 and 30, 60 and 40, 65 and 35, and 45 and 55, among others. Children use number lines and matchstick bundles to discover different ways to make 100.
10What is a ginladi and how is it used?
A ginladi is mentioned in the chapter as a hands-on tool used along with matchstick bundles to make 100 and other numbers in different ways. Children use it to explore number combinations through activities.
11How does the chapter link maths to real life?
Children are asked to estimate and count real objects — matchsticks in a box, seeds like kidney beans and chickpeas in their hand or a small bowl — and figure out how many handfuls or boxes are needed to reach 100 or 200.
12What number range does this chapter cover?
The chapter covers numbers from 1 and 2 (in the Snakes and Ladders activity) through 100, and then builds all the way up to 200, giving children a solid understanding of three-digit numbers up to the Double Century.
More chapters in Maths Mela
Read Chapter 3 of Maths Mela, the Class 3 Mathematics NCERT textbook (2026-27 edition), online for free: the complete chapter as published by NCERT with every diagram, solved example and exercise, with step-by-step solutions, answers and revision notes. Open the NCERT PDF above, or browse all NCERT Class 3 textbooks.
Read offline with notes, solutions & mock tests
CBSE Prepmaster — free on iOS & Android