Subtract 98/18 from 90/40
1st number: 2 10/40, 2nd number: 5 8/18
90/40 - 98/18 is -115/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 18 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
90/40 = 90 × 9/40 × 9 = 810/360 - Likewise, for the 2nd fraction, since 18 × 20 = 360,
98/18 = 98 × 20/18 × 20 = 1960/360 - Subtract the two like fractions:
810/360 - 1960/360 = 810 - 1960/360 = -1150/360 - After reducing the fraction, the answer is -115/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80-98/18 90/40-98/36 90/40-98/54 90/40-98/90