Question

By how much is -20 less than 20​

Answer 1

40

Explanation:

20 - 40 = -20

Answer 2

Using zero as a reference point 20 is 20 units above zero and -20 is 20 units below zero.

20 + 20 = 40

-20 and 20 are 40 units away from each other.

-20 is 40 less than 20