Subtract 60/80 from 28/90
28/90 - 60/80 is -79/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
28/90 = 28 × 8/90 × 8 = 224/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
60/80 = 60 × 9/80 × 9 = 540/720 - Subtract the two like fractions:
224/720 - 540/720 = 224 - 540/720 = -316/720 - After reducing the fraction, the answer is -79/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-60/80 84/90-60/80