Question

What is the answer ?

Answer 1

642

Explanation:

639 -127 = x -130

x = 639 -127 +130 = 639 +3 = 642

Answer 2

642

Explanation:

use inverse operations

first find the difference of 639 and 127 to get 512

then using inverse operations add 512 to 130 to get 642

check by subtracting 642 by 130 to get 512