Subtract 1/21 from 81/72
1st number: 1 9/72, 2nd number: 1/21
81/72 - 1/21 is 181/168.
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,
81/72 = 81 × 7/72 × 7 = 567/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
1/21 = 1 × 24/21 × 24 = 24/504 - Subtract the two like fractions:
567/504 - 24/504 = 567 - 24/504 = 543/504 - After reducing the fraction, the answer is 181/168
- In mixed form: 113/168
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