Question

Find the following using number line. 

i) 6 + 7 + 7 

ii) 18 – 9 

iii) 5 × 3

Answer 1

i) 6 + 7 + 7

Draw the number line starting from zero (0). 

Starting from 6, we make 7 jumps to the right of 6 on the number line. Then we reach 13. 

Again make 7 jumps to the right of 13. Then we reach 20. 

So, 6 + 7 + 7 = 20

ii) 18 – 9

Draw the number line starting from zero (0). 

Start from 18. We make 9 jumps to the left of 18 on the number line. 

Then we reach 9. 

So, 18 – 9 = 9

iii) 5 × 3

Draw the number line starting from zero (0). 

Start from 0 and make 3 jumps to the right of the zero on the number line. 

Now, treat 3 jumps as one step. 

So, to make 5 steps (i.e., 3, 6, 9, 12 and 15) move on the right side, we read 15 on the number line. 

So, 5 × 3 = 15