Subtract 1/28 from 20/30
20/30 - 1/28 is 53/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 30 × 14 = 420,
20/30 = 20 × 14/30 × 14 = 280/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
1/28 = 1 × 15/28 × 15 = 15/420 - Subtract the two like fractions:
280/420 - 15/420 = 280 - 15/420 = 265/420 - After reducing the fraction, the answer is 53/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-1/28 20/30-2/28 20/60-1/28 20/30-1/56 60/30-1/28 20/30-3/28 20/90-1/28 20/30-1/84 20/30-5/28 20/30-7/28