Subtract 70/9 from 28/40
1st number: 28/40, 2nd number: 7 7/9
28/40 - 70/9 is -637/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
28/40 = 28 × 9/40 × 9 = 252/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
70/9 = 70 × 40/9 × 40 = 2800/360 - Subtract the two like fractions:
252/360 - 2800/360 = 252 - 2800/360 = -2548/360 - After reducing the fraction, the answer is -637/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40-70/9 28/80-70/9 28/40-70/18 84/40-70/9 28/40-70/27 28/40-70/45 28/40-70/63