Subtract 1/42 from 18/80
18/80 - 1/42 is 169/840.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
18/80 = 18 × 21/80 × 21 = 378/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
1/42 = 1 × 40/42 × 40 = 40/1680 - Subtract the two like fractions:
378/1680 - 40/1680 = 378 - 40/1680 = 338/1680 - After reducing the fraction, the answer is 169/840
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