65-21, 85+17, 19+11, 42-22, 36-87, 69+31, 69-31, 44-23, 56+13, 47+31, 11+11, 13+24, 24-8, 82-16, 64-66, 64-16, 45+15, 22-18, 14+9, 16+16, 32+31, 35-14, 26-14, 36-14.

6Pt1 Quick addition and subtraction (numbers less than 100)

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