Subtract 16/20 from 72/21
1st number: 3 9/21, 2nd number: 16/20
72/21 - 16/20 is 92/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
72/21 = 72 × 20/21 × 20 = 1440/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
16/20 = 16 × 21/20 × 21 = 336/420 - Subtract the two like fractions:
1440/420 - 336/420 = 1440 - 336/420 = 1104/420 - After reducing the fraction, the answer is 92/35
- In mixed form: 222/35
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