simplify -4 ⅕ - (- 9/10)

Answer 1

First, we solve out the mixed fraction  -4 ⅕=5x-4(+1)/5 =-19/5

Now we simplify

-19/5-(-9/10) = 10/5 = 2, 2x-19 =-38/10

-38/10 - (-9/10) = -38+9/10 = -29/10

Answer 2

-4.2 + 0.9 = ?