Subtract 30/40 from 5/15
5/15 - 30/40 is -5/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
5/15 = 5 × 8/15 × 8 = 40/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
30/40 = 30 × 3/40 × 3 = 90/120 - Subtract the two like fractions:
40/120 - 90/120 = 40 - 90/120 = -50/120 - After reducing the fraction, the answer is -5/12
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