Subtract 21/16 from 56/70, Solve 56/70

Subtract 21/16 from 56/70

1^st number: 56/70, 2^nd number: 1 5/16

56/70 - 21/16 is -41/80.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 16 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 70 × 8 = 560,
56/70 = 56 × 8/70 × 8 = 448/560
Likewise, for the 2nd fraction, since 16 × 35 = 560,
21/16 = 21 × 35/16 × 35 = 735/560
Subtract the two like fractions:
448/560 - 735/560 = 448 - 735/560 = -287/560
After reducing the fraction, the answer is -41/80

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