Subtract 5/21 from 72/42
1st number: 1 30/42, 2nd number: 5/21
72/42 - 5/21 is 31/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
72/42 = 72 × 1/42 × 1 = 72/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
5/21 = 5 × 2/21 × 2 = 10/42 - Subtract the two like fractions:
72/42 - 10/42 = 72 - 10/42 = 62/42 - After reducing the fraction, the answer is 31/21
- In mixed form: 110/21
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