Subtract 20/80 from 15/28
15/28 - 20/80 is 2/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 28 × 20 = 560,
15/28 = 15 × 20/28 × 20 = 300/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
20/80 = 20 × 7/80 × 7 = 140/560 - Subtract the two like fractions:
300/560 - 140/560 = 300 - 140/560 = 160/560 - After reducing the fraction, the answer is 2/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28-20/80 15/28-40/80 15/56-20/80 45/28-20/80 15/28-60/80 15/84-20/80 75/28-20/80