Subtract 8/42 from 3/20
3/20 - 8/42 is -17/420.
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,
3/20 = 3 × 21/20 × 21 = 63/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
8/42 = 8 × 10/42 × 10 = 80/420 - Subtract the two like fractions:
63/420 - 80/420 = 63 - 80/420 = -17/420
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