Question

draw and label a picture to show how knowing 7+7 helps you find 7+8

Answer 1

so you only have to add 1 more 7 instead of 8 and 7 plus 7 is easier to add then 7 plus 8 

Answer 2

1.   7 + 7

As 7 and 7 both of them are integers.So adding them results in 14.

Integer 7 is on the right of number line. For adding 7 , you have to move 7 units on the right of number line.

So, 7 + 7 = 14-----(1)

To find : 7 + 8

Write it as 1.7 + 7 + 1  Or     2. 7 + 1 + 7

1.= 14 + 1   Or  use Associative law of addition i.e  2. 7+7+1

1= 15  Or     . 2=   14+1= 15    [Using (1)]