Subtract 21/40 from 18/12
1st number: 1 6/12, 2nd number: 21/40
18/12 - 21/40 is 39/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 12 × 10 = 120,
18/12 = 18 × 10/12 × 10 = 180/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Subtract the two like fractions:
180/120 - 63/120 = 180 - 63/120 = 117/120 - After reducing the fraction, the answer is 39/40
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