7+4=, 10+8=, 10-3=, 12-6=, 19+1=, 15-5=, 18-3=, 14-4=, 5+10=, 16+1=, 11+6=, 16-6=, 20-10=, 18-8=, 8+2=, 18+2=, 12+8=, 9+11=, 3+17=, 6+14=, 4+11=, 17-0=, 11-0=.

Addition and Subtraction to 20

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