Subtract 72/7 from 10/30
1st number: 10/30, 2nd number: 10 2/7
10/30 - 72/7 is -209/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
72/7 = 72 × 30/7 × 30 = 2160/210 - Subtract the two like fractions:
70/210 - 2160/210 = 70 - 2160/210 = -2090/210 - After reducing the fraction, the answer is -209/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/30-72/7 10/60-72/7 10/30-72/14 10/90-72/7 10/30-72/21 50/30-72/7 10/30-72/35 70/30-72/7 10/30-72/49