Question

subtract.
38 - 30 =
9 - (-11) =

Explanation:

Step1: Calculate 38 - 30

Subtract the tens digits.
$38-30 = 8$

Step2: Calculate 9 - (-11)

Change subtraction of negative to addition.
$9-(-11)=9 + 11=20$

Answer:

$38 - 30 = 8$
$9-(-11)=20$