Add whole tens to 2-digit numbers

Solve these mental math problems!

1) Solve
80+50=
2) Solve
50+32=
3) Solve
60+16=
4) Solve
40+30=
5) Solve
20+32=
6) Solve
90+83=
7) Solve
60+24=
8) Solve
50+19=
9) Solve
70+89=
10) Solve
20+12=
11) Solve
50+67=
12) Solve
40+73=
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