Subtract 70/30 from 7/84, Solve 7/84

Subtract 70/30 from 7/84

1^st number: 7/84, 2^nd number: 2 10/30

7/84 - 70/30 is -9/4.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 84 × 5 = 420,
7/84 = 7 × 5/84 × 5 = 35/420
Likewise, for the 2nd fraction, since 30 × 14 = 420,
70/30 = 70 × 14/30 × 14 = 980/420
Subtract the two like fractions:
35/420 - 980/420 = 35 - 980/420 = -945/420
After reducing the fraction, the answer is -9/4

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