Subtract 2/21 from 4/72
4/72 - 2/21 is -5/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
4/72 = 4 × 7/72 × 7 = 28/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
2/21 = 2 × 24/21 × 24 = 48/504 - Subtract the two like fractions:
28/504 - 48/504 = 28 - 48/504 = -20/504 - After reducing the fraction, the answer is -5/126
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