Page 32 - ICSE Math 6

Step 3: Now, move five units further to the right to reach at 8.

0 1 2 3 4 5 6 7 8 9 10
Thus, 3 + 5 = 8

Subtraction of whole numbers on a number line
We can subtract whole numbers on a number line.
Let’s subtract whole number 3 from 5.

Step 1: Draw a number line as shown.

0 1 2 3 4 5 6 7 8 9 10

Step 2: First move five units to the right of ‘0’ to reach at 5.

0 1 2 3 4 5 6 7 8 9 10
Step 3: Now, move three units to the left from 5 to reach at 2.

0 1 2 3 4 5 6 7 8 9 10
Thus, 5 – 3 = 2

Multiplication of whole numbers on a number line
We can also multiply whole numbers using a number line.
Let’s multiply whole numbers 2 and 4.
Step 1: Draw a number line as shown.

Try These
0 1 2 3 4 5 6 7 8 9 10
1. Add 6 and 2 on the number
Step 2: Take four jumps of two units each to the right of ‘0’ to reach line.
at 8. 2. Solve (9 – 4) using the number
line.
3. Use the number line to find the
0 1 2 3 4 5 6 7 8 9 10 value of 3 × 3.
Thus, 2 × 4 = 8
Example 1: How many whole numbers are there between 33 and 53?

Solution: Whole numbers between 33 and 53 are 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45,
46, 47, 48, 49, 50, 51 and 52.
Therefore, there are 19 whole numbers between 33 and 53.

Example 2: In each of the following pairs of numbers, state which whole number is on the left of
the other number on the number line. Also, compare them using the appropriate sign
‘>’ or ‘<’.
(a) 640; 604 (b) 567; 765 (c) 98,965; 56,789

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