Subtract 20/12 from 3/70, Solve 3/70

Subtract 20/12 from 3/70

1^st number: 3/70, 2^nd number: 1 8/12

3/70 - 20/12 is -341/210.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 12 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 70 × 6 = 420,
3/70 = 3 × 6/70 × 6 = 18/420
Likewise, for the 2nd fraction, since 12 × 35 = 420,
20/12 = 20 × 35/12 × 35 = 700/420
Subtract the two like fractions:
18/420 - 700/420 = 18 - 700/420 = -682/420
After reducing the fraction, the answer is -341/210

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