Subtract 20/25 from 21/30
21/30 - 20/25 is -1/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 25 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 30 × 5 = 150,
21/30 = 21 × 5/30 × 5 = 105/150 - Likewise, for the 2nd fraction, since 25 × 6 = 150,
20/25 = 20 × 6/25 × 6 = 120/150 - Subtract the two like fractions:
105/150 - 120/150 = 105 - 120/150 = -15/150 - After reducing the fraction, the answer is -1/10
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