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\ 03-Oct-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

(c)
1 2 3 4 5 8 9 10 13 14 15 16 17 20

(d)
0 1 2 4 5 6 8 9 10 11 13 15 17 20

(e)
0 1 2 3 4 5 7 10 11 12 15 17 18 19 20

forwArd ANd bACkwArd CouNtiNg

Look at the following number strip.

Left Right

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Let us count the numbers left to right starting from 4.

4 5 6 7 8 9 10

This type of counting is called forward counting.

Now, let us count the numbers right to left starting from 15.

15 14 13 12 11 10 9

This type of counting is called backward counting.

Practice time 2f

1. Count forward and write the missing numbers.

(a) 3 4 5 9

(b) 6 7 8 20

(c) 4 5 11 16

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