Missing Addend (1 & 2-Digit)

Solve these mental math problems!

1) Solve
69-68=
2) Solve
16-12=
3) Solve
75-66=
4) Solve
75-69=
5) Solve
47-46=
6) Solve
80-72=
7) Solve
44-43=
8) Solve
41-32=
9) Solve
28-19=
10) Solve
24-22=
11) Solve
29-22=
12) Solve
43-41=
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