Subtract 18/20 from 90/28
1st number: 3 6/28, 2nd number: 18/20
90/28 - 18/20 is 81/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
90/28 = 90 × 5/28 × 5 = 450/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
18/20 = 18 × 7/20 × 7 = 126/140 - Subtract the two like fractions:
450/140 - 126/140 = 450 - 126/140 = 324/140 - After reducing the fraction, the answer is 81/35
- In mixed form: 211/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/28-36/20 90/56-18/20 90/28-18/40 90/28-54/20 90/84-18/20 90/28-18/60 90/28-90/20