Subtract 5/21 from 6/72
6/72 - 5/21 is -13/84.
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,
6/72 = 6 × 7/72 × 7 = 42/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
5/21 = 5 × 24/21 × 24 = 120/504 - Subtract the two like fractions:
42/504 - 120/504 = 42 - 120/504 = -78/504 - After reducing the fraction, the answer is -13/84
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