Question

What is the answer to 89-39

Answer 1

$89 - 39 = (80 +9) - (30+9) = 80 - 30 + 9 - 9 = 80 - 30 = \boxed{50}$

Answer 2

89 - 39 = 50

The 9s in the ones digit 9 - 9 = 0
8 - 3 = 5

So 50