Subtract 81/20 from 90/35
1st number: 2 20/35, 2nd number: 4 1/20
90/35 - 81/20 is -207/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 35 × 4 = 140,
90/35 = 90 × 4/35 × 4 = 360/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
81/20 = 81 × 7/20 × 7 = 567/140 - Subtract the two like fractions:
360/140 - 567/140 = 360 - 567/140 = -207/140
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