Subtract whole tens from 2-digit

Solve these mental math problems!

1) Solve
86-50=
2) Solve
83-80=
3) Solve
94-90=
4) Solve
59-30=
5) Solve
99-70=
6) Solve
98-70=
7) Solve
97-40=
8) Solve
98-60=
9) Solve
39-30=
10) Solve
96-90=
11) Solve
17-10=
12) Solve
98-70=
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