Subtract 4/12 from 21/40
21/40 - 4/12 is 23/120.
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,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 12 × 10 = 120,
4/12 = 4 × 10/12 × 10 = 40/120 - Subtract the two like fractions:
63/120 - 40/120 = 63 - 40/120 = 23/120
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