Subtract 18/8 from 90/42
1st number: 2 6/42, 2nd number: 2 2/8
90/42 - 18/8 is -3/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
90/42 = 90 × 4/42 × 4 = 360/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
18/8 = 18 × 21/8 × 21 = 378/168 - Subtract the two like fractions:
360/168 - 378/168 = 360 - 378/168 = -18/168 - After reducing the fraction, the answer is -3/28
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