Bonjour
a. 7/15 + 3/5 = 10/15 = (5 x 2) / (5 x 3) = 2/3
b. 5/8 - 1/8 = 4/8 = (4 x 1) / (4 x 2) = 1/2
c. 7/9 - 1/9 = 6/9 = (3 x 2) / (3 x 3) = 2/3.
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Bonjour
a. 7/15 + 3/5 = 10/15 = (5 x 2) / (5 x 3) = 2/3
b. 5/8 - 1/8 = 4/8 = (4 x 1) / (4 x 2) = 1/2
c. 7/9 - 1/9 = 6/9 = (3 x 2) / (3 x 3) = 2/3.