Hi Molly, get the denominators to be the same by multiplying then multiply the numerators by the same - so 7x8=56 and 7x5=35 = 35/56 and 8x7=56 and 8x2=16 = 16/56 so the sum is 35/56 - 16/56 = 19/56
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Hi Molly, get the denominators to be the same by multiplying then multiply the numerators by the same - so 7x8=56 and 7x5=35 = 35/56 and 8x7=56 and 8x2=16 = 16/56 so the sum is 35/56 - 16/56 = 19/56