Subtract 70/9 from 30/28
1st number: 1 2/28, 2nd number: 7 7/9
30/28 - 70/9 is -845/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
30/28 = 30 × 9/28 × 9 = 270/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
70/9 = 70 × 28/9 × 28 = 1960/252 - Subtract the two like fractions:
270/252 - 1960/252 = 270 - 1960/252 = -1690/252 - After reducing the fraction, the answer is -845/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28-70/9 30/56-70/9 30/28-70/18 90/28-70/9 30/84-70/9 30/28-70/27 30/28-70/45 30/28-70/63