Subtract 81/30 from 28/14, Solve 2 0/14

Subtract 81/30 from 28/14

1^st number: 2 0/14, 2^nd number: 2 21/30

28/14 - 81/30 is -7/10.

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,
28/14 = 28 × 15/14 × 15 = 420/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
81/30 = 81 × 7/30 × 7 = 567/210
Subtract the two like fractions:
420/210 - 567/210 = 420 - 567/210 = -147/210
After reducing the fraction, the answer is -7/10

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