Subtract 9/15 from 18/21
18/21 - 9/15 is 9/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
18/21 = 18 × 5/21 × 5 = 90/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
9/15 = 9 × 7/15 × 7 = 63/105 - Subtract the two like fractions:
90/105 - 63/105 = 90 - 63/105 = 27/105 - After reducing the fraction, the answer is 9/35
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