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Addition on the number StriP

We can use a number strip to add numbers.

Suppose we have to find 5 + 8.

To add 5 and 8, we start from 8 on the number strip (line) and move 5 steps (ones)
forward.
1 2 3 4 5 We reach 13.

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

So, 5 + 8 = 13
Similarly, 9 + 6 = 15
1 2 3 4 5 6

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

activity
Count the number of books you have in your school bag. ………

Count the number of notebooks in your school bag. ………

How many books and notebooks do you have altogether? ………
Repeat the activity with your friend and compare the results.

Practice time 3b

Add the following using the given number strip.

1. 5 + 4 =

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

2. 7 + 9 =

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

3. 8 + 6 =

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

42 Mathematics-1