Subtract 21/70 from 4/54, Solve 4/54

Subtract 21/70 from 4/54

4/54 - 21/70 is -61/270.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 70 is 1890

Next, find the equivalent fraction of both fractional numbers with denominator 1890
For the 1st fraction, since 54 × 35 = 1890,
4/54 = 4 × 35/54 × 35 = 140/1890
Likewise, for the 2nd fraction, since 70 × 27 = 1890,
21/70 = 21 × 27/70 × 27 = 567/1890
Subtract the two like fractions:
140/1890 - 567/1890 = 140 - 567/1890 = -427/1890
After reducing the fraction, the answer is -61/270

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