Subtract 3/20 from 30/28
1st number: 1 2/28, 2nd number: 3/20
30/28 - 3/20 is 129/140.
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,
30/28 = 30 × 5/28 × 5 = 150/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
3/20 = 3 × 7/20 × 7 = 21/140 - Subtract the two like fractions:
150/140 - 21/140 = 150 - 21/140 = 129/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28-3/20 30/28-6/20 30/56-3/20 30/28-3/40 90/28-3/20 30/28-9/20 30/84-3/20 30/28-3/60 30/28-15/20 30/28-21/20