Subtract 21/12 from 84/40
1st number: 2 4/40, 2nd number: 1 9/12
84/40 - 21/12 is 7/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
84/40 = 84 × 3/40 × 3 = 252/120 - Likewise, for the 2nd fraction, since 12 × 10 = 120,
21/12 = 21 × 10/12 × 10 = 210/120 - Subtract the two like fractions:
252/120 - 210/120 = 252 - 210/120 = 42/120 - After reducing the fraction, the answer is 7/20
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