Subtract 9/35 from 21/54, Solve 21/54

Subtract 9/35 from 21/54

21/54 - 9/35 is 83/630.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 35 is 1890

Next, find the equivalent fraction of both fractional numbers with denominator 1890
For the 1st fraction, since 54 × 35 = 1890,
21/54 = 21 × 35/54 × 35 = 735/1890
Likewise, for the 2nd fraction, since 35 × 54 = 1890,
9/35 = 9 × 54/35 × 54 = 486/1890
Subtract the two like fractions:
735/1890 - 486/1890 = 735 - 486/1890 = 249/1890
After reducing the fraction, the answer is 83/630

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