Subtract 4/70 from 21/24, Solve 21/24

Subtract 4/70 from 21/24

21/24 - 4/70 is 229/280.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 70 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 24 × 35 = 840,
21/24 = 21 × 35/24 × 35 = 735/840
Likewise, for the 2nd fraction, since 70 × 12 = 840,
4/70 = 4 × 12/70 × 12 = 48/840
Subtract the two like fractions:
735/840 - 48/840 = 735 - 48/840 = 687/840
After reducing the fraction, the answer is 229/280

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