Subtract 21/30 from 1/28
1/28 - 21/30 is -93/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
1/28 = 1 × 15/28 × 15 = 15/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
21/30 = 21 × 14/30 × 14 = 294/420 - Subtract the two like fractions:
15/420 - 294/420 = 15 - 294/420 = -279/420 - After reducing the fraction, the answer is -93/140
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