Add whole tens to 2-digit numbers

Solve these mental math problems!

1) Solve
60+81=
2) Solve
30+43=
3) Solve
10+86=
4) Solve
80+63=
5) Solve
90+20=
6) Solve
90+66=
7) Solve
10+32=
8) Solve
60+65=
9) Solve
40+52=
10) Solve
80+18=
11) Solve
90+14=
12) Solve
30+52=
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