Subtract 21/63 from 15/18
15/18 - 21/63 is 1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
15/18 = 15 × 7/18 × 7 = 105/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
21/63 = 21 × 2/63 × 2 = 42/126 - Subtract the two like fractions:
105/126 - 42/126 = 105 - 42/126 = 63/126 - After reducing the fraction, the answer is 1/2
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