Subtract 72/20 from 2/70, Solve 2/70

Subtract 72/20 from 2/70

1^st number: 2/70, 2^nd number: 3 12/20

2/70 - 72/20 is -25/7.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140

Next, find the equivalent fraction of both fractional numbers with denominator 140
For the 1st fraction, since 70 × 2 = 140,
2/70 = 2 × 2/70 × 2 = 4/140
Likewise, for the 2nd fraction, since 20 × 7 = 140,
72/20 = 72 × 7/20 × 7 = 504/140
Subtract the two like fractions:
4/140 - 504/140 = 4 - 504/140 = -500/140
After reducing the fraction, the answer is -25/7

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