CBSE Solutions For Class 3 Maths Chapter 3 Double Century

CBSE Notes For Class 3 Maths Mela Chapter 3 Double Century

The Story Of Our Numbers

Tens of thousands of years ago, people started counting. They wanted to keep records of their things. So they made marks on the walls of caves and on the barks of trees.

Over time, they kept records of their things by making groups of 5, 10, 20, and 60.

Thousands of years ago, the ancient Indians created a method for
writing any number, however large, using only ten symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. It was one of the most ingenious and creative inventions in human history. It made possible the invention of TVs, computers, mobile phones, and more. This method of writing numbers is now used everywhere in every country in the world.

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A very important part of this invention was the introduction and use of the symbol “0” to mean “nothing”. It is the number 0 that made this system of writing numerals work!

Over the next few months, we will learn how to write all numbers, however large, using just these ten symbols.

Let Us Do

Question 1. Look at the picture. Estimate and write the number of each of the following objects.

Double Century The number of each of the following objects

  1. Oranges: _________
  2. Bangles: _________
  3. Laddoos: _________
  4. Barfi: _________
  5. Bindis: _________
  6. Bananas: _________

Answer:

Let Us Play

Fill in the missing numbers on the board.

Double Century Numbers on the board

Answer the following on the basis of the Snakes and Ladders board:

  1. Which number will you reach if you take the ladder from 13?
  2. If you are on the snake at number 25, which number will you reach?
  3. You are standing on 96. Which number on the die will take you to the snake’s mouth?
  4. Show the number written on the tail of the longest snake using bundles and loose sticks. _____

Let Us Think

Double Century I am a talking pot

These beads are also 100 in number.

Let Us Do

Question 1. Fill in the blanks.

Double Century Number sentance

Bholu made 100 by jumping on 65 and then 35 more.

Double Century Bholu made 100 by jumping

Question 2. Use matchstick bundles and a glad to make 100 in different ways. Fill in the table below.

Double Century A ginladi to make 100 in different ways

Question 3. Write numbers in the blank spaces inside the flower petals so that the numbers in each petal add up to 100.

Double Century The flower petals

Let Us Explore

How many are 100?

Question 1. Open a full box of matchsticks.

  • Estimate the number of matchsticks in the box: ________
  • Count the number of matchsticks in the box: _________
  • How close was your estimate?
  • How many boxes of matchsticks will get the total close to 100 matchsticks? ________ boxes.

Double Century Full box of matchsticks

Question 2. Take a handful of seeds like kidney beans, chickpeas, etc.

  • Estimate the number of seeds you have in your hand: ________
  • Count the number of seeds in your hand: _________
  • How many handfuls of seeds will get the total close to 100 seeds? ________ handfuls.

Double Century A handful of seeds like kidney beans

Double Century Numbers beyond 100

Fill in the blank spaces on the number line given at the edge of the page.

Let Us Do

Question 1. Let’s continue making numbers above 100 using matchsticks bundles and loose sticks.

In the table given proxy. identify the bundles and loose sticks and write the corresponding numbers.

Double Century The bundles

Extend the table in your notebook to 150. Do you observe something common in all the numbers?

Match the number with the correct bundles and loose sticks.

Double Century Bundles and loose sticks

Oh! Talking Pot is back. It will say one more than whatever you say.

Double Century Talking pot is back

Fill in the blank spaces on the number line.

Double Century The blank spaces on the number line

Show the following numbers on the number line below.

  1. Place an arrow on 125.
  2. Make a tree on 112.
  3. Make a smiley on 149.
  4. Put a cross on 137.

Double Century The number line below

Let Us Play

Double Century Numbers by clap

Play this game in two teams. One team will show a number using clap, snap, and pat and the other team will guess it. Example: Clap- Snap Snap- Pat Pat Pat means 123 (One hundred and twenty-three).

Let’s now count beyond 150.

Double Century Count beyond 150

Extend this table to 200 in your notebook How much is 200?

Let Us Do At Home

Question 1. Fill a small container like a small bowl with seeds such as kidney beans, chickpeas, etc.

Double Century Small bowl with seeds

Question 2. Look closely at the container to estimate how many seeds are in it. Your Estimate: _______ seeds.

Question 3. Now count and see how close your estimation is to the actual number of seeds. Counted _____ seeds.

Double Century Counted seeds

Question 4. Guess how many times you need to fill the container to get close to 200 seeds. Your guess: _____ time.

Double Century Container to get close to 200 seeds

Write the numbers in order on the stones.

Let Us Do

Jumping Game

Question 1. Draw jumps of 5 on the number line and write the numbers on the number line in the given spaces.

Double Century Jumps of 5 on the number line

Question 2. Continue jumps of 20 and write the missing numbers on the given number line.

Double Century Jumps of 20

Question 3. Fill in the table.

Double Century The table

Question 4. Show at least two different ways of making the following numbers.

  1. Use matchsticks bundles to make 125.
  2. Make 145 using a glade.
  3. Make 170 on a number line.

Question 5. Fill in the empty boxes appropriately.

Double Century The empty boxes

Question 6. Mark the following numbers on the number line.

1. 109, 112, 124, 134, 146

Double Century Number line 146

2. 155, 163, 178, 189, 198

Double Century Number line 198

3. 125, 142, 153, 174, 199

Double Century Number line 199

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