11, 12, 14, 10, , 10, 7, 8, 9, , 15, 17, 18, 16, , 16, 18, 17, 15, , 11+13=24, 11+14=24, 11+30=24, 11+13=23, , 180-90=90, 118-90=90, 108-19=89, 1,80-9,10=9,10, , 20, 18, 19, 21, , 6, 8, 7, 9, , 5=9+14, 5+9=14, 5+9=40, 5-9=4, , 17+70=87, 7+10+70=87, 70+17=87, 70+70=187.

Basic Math Problems: Addition and Subtraction

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