Subtract 90/27 from 5/70, Solve 5/70

Subtract 90/27 from 5/70

1^st number: 5/70, 2^nd number: 3 9/27

5/70 - 90/27 is -137/42.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 27 is 1890

Next, find the equivalent fraction of both fractional numbers with denominator 1890
For the 1st fraction, since 70 × 27 = 1890,
5/70 = 5 × 27/70 × 27 = 135/1890
Likewise, for the 2nd fraction, since 27 × 70 = 1890,
90/27 = 90 × 70/27 × 70 = 6300/1890
Subtract the two like fractions:
135/1890 - 6300/1890 = 135 - 6300/1890 = -6165/1890
After reducing the fraction, the answer is -137/42

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