Subtract 70/30 from 21/14, Solve 1 7/14

Subtract 70/30 from 21/14

1^st number: 1 7/14, 2^nd number: 2 10/30

21/14 - 70/30 is -5/6.

Find the least common denominator or LCM of the two denominators:
LCM of 14 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 14 × 15 = 210,
21/14 = 21 × 15/14 × 15 = 315/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
70/30 = 70 × 7/30 × 7 = 490/210
Subtract the two like fractions:
315/210 - 490/210 = 315 - 490/210 = -175/210
After reducing the fraction, the answer is -5/6

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