Subtract 18/72 from 15/75
15/75 - 18/72 is -1/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 72 is 1800
Next, find the equivalent fraction of both fractional numbers with denominator 1800 - For the 1st fraction, since 75 × 24 = 1800,
15/75 = 15 × 24/75 × 24 = 360/1800 - Likewise, for the 2nd fraction, since 72 × 25 = 1800,
18/72 = 18 × 25/72 × 25 = 450/1800 - Subtract the two like fractions:
360/1800 - 450/1800 = 360 - 450/1800 = -90/1800 - After reducing the fraction, the answer is -1/20
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