Subtract 20/28 from 7/30
7/30 - 20/28 is -101/210.
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,
7/30 = 7 × 14/30 × 14 = 98/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
20/28 = 20 × 15/28 × 15 = 300/420 - Subtract the two like fractions:
98/420 - 300/420 = 98 - 300/420 = -202/420 - After reducing the fraction, the answer is -101/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30-20/28 7/30-40/28 7/60-20/28 7/30-20/56 21/30-20/28 7/30-60/28 7/90-20/28 7/30-20/84 35/30-20/28 49/30-20/28