Subtract 30/42 from 2/20
2/20 - 30/42 is -43/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
2/20 = 2 × 21/20 × 21 = 42/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
30/42 = 30 × 10/42 × 10 = 300/420 - Subtract the two like fractions:
42/420 - 300/420 = 42 - 300/420 = -258/420 - After reducing the fraction, the answer is -43/70
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