Subtract 30/15 from 6/21
1st number: 6/21, 2nd number: 2 0/15
6/21 - 30/15 is -12/7.
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,
6/21 = 6 × 5/21 × 5 = 30/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
30/15 = 30 × 7/15 × 7 = 210/105 - Subtract the two like fractions:
30/105 - 210/105 = 30 - 210/105 = -180/105 - After reducing the fraction, the answer is -12/7
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