Subtract 28/30 from 2/7
2/7 - 28/30 is -68/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 7 × 30 = 210,
2/7 = 2 × 30/7 × 30 = 60/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
28/30 = 28 × 7/30 × 7 = 196/210 - Subtract the two like fractions:
60/210 - 196/210 = 60 - 196/210 = -136/210 - After reducing the fraction, the answer is -68/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/7-28/30 2/7-56/30 2/14-28/30 2/7-28/60 6/7-28/30 2/7-84/30 2/21-28/30 2/7-28/90 10/7-28/30 2/35-28/30 14/7-28/30 2/49-28/30