3/10, 6/20
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7/20 = 14/40, 21/60, 28/80, ...
Three equivalent fractions for nine tenths are 81/90 63/70 99/110
7/9
fourteen eighteenths
Yes, 2/7 and 6/21 are equivalent. 2/7 * 3/3 = 6/21. Since 3/3 is the same as 1, we know the fractions are equivalent.