Missing Addend (1 & 2-Digit)

Solve these mental math problems!

1) Solve
87-79=
2) Solve
83-80=
3) Solve
70-61=
4) Solve
48-42=
5) Solve
25-19=
6) Solve
57-48=
7) Solve
38-31=
8) Solve
13-12=
9) Solve
57-53=
10) Solve
28-26=
11) Solve
41-34=
12) Solve
38-37=
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