12+5=, 17, 18, 8+8=, 14, 16, 12-6=, 10, 6, 17-9=, 8, 10, 14-7=, 7, 9, 6+5=, 11, 12, 7+5=, 15, 12, 9+9=, 18, 14, 10+10=, 20, 18, 16-4=, 15, 12

Adding/Subtracting within 20

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