Subtract 30/60 from 1/21
1/21 - 30/60 is -19/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
1/21 = 1 × 20/21 × 20 = 20/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
30/60 = 30 × 7/60 × 7 = 210/420 - Subtract the two like fractions:
20/420 - 210/420 = 20 - 210/420 = -190/420 - After reducing the fraction, the answer is -19/42
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