Subtract 30/35 from 10/21
10/21 - 30/35 is -8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
10/21 = 10 × 5/21 × 5 = 50/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
30/35 = 30 × 3/35 × 3 = 90/105 - Subtract the two like fractions:
50/105 - 90/105 = 50 - 90/105 = -40/105 - After reducing the fraction, the answer is -8/21
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