Subtract 21/72 from 21/20
1st number: 1 1/20, 2nd number: 21/72
21/20 - 21/72 is 91/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
21/20 = 21 × 18/20 × 18 = 378/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Subtract the two like fractions:
378/360 - 105/360 = 378 - 105/360 = 273/360 - After reducing the fraction, the answer is 91/120
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