Subtract 98/90 from 42/72
1st number: 42/72, 2nd number: 1 8/90
42/72 - 98/90 is -91/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
42/72 = 42 × 5/72 × 5 = 210/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
98/90 = 98 × 4/90 × 4 = 392/360 - Subtract the two like fractions:
210/360 - 392/360 = 210 - 392/360 = -182/360 - After reducing the fraction, the answer is -91/180
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Related: 84/72-98/90