Doubles and Near Doubles

Solve the addition problems below.

1) Solve
33+33=
2) Solve
35+35=
3) Solve
18+18=
4) Solve
34+34=
5) Solve
35+35=
6) Solve
12+13=
7) Solve
23+24=
8) Solve
37+37=
9) Solve
44+44=
10) Solve
10+11=
11) Solve
44+45=
12) Solve
43+43=
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