Subtract 4/72 from 7/21
7/21 - 4/72 is 5/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
7/21 = 7 × 24/21 × 24 = 168/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
4/72 = 4 × 7/72 × 7 = 28/504 - Subtract the two like fractions:
168/504 - 28/504 = 168 - 28/504 = 140/504 - After reducing the fraction, the answer is 5/18
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