## Solution 1

Break the equation in 2…

17 + 47 = 64

Now you know whatever you add to 7 MUST equal 64.

The opposite of addition is subtraction so …. 64-7 = 57

Final answer 57

## Solution 2

The answer is 57. 17 + 47 = 64 so 64 – 7 = 57

## Solution 3

I’ll give it a shot…

17+47=7+57

## Solution 4

It just wants you to find the other number.

47

+17

=64

So you have 64. 7 plus what makes 64?

64

- 7

=57

17+47=7+57

There you go. 😀

## Solution 5

17+47=64

7+?=64

?=64-7

?=57

## Solution 6

17+47=7+x

17+47-7=7-7+x

57=x