Subtract 81/84 from 42/20
1st number: 2 2/20, 2nd number: 81/84
42/20 - 81/84 is 159/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
42/20 = 42 × 21/20 × 21 = 882/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
81/84 = 81 × 5/84 × 5 = 405/420 - Subtract the two like fractions:
882/420 - 405/420 = 882 - 405/420 = 477/420 - After reducing the fraction, the answer is 159/140
- In mixed form: 119/140
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