Subtract 60/20 from 80/90
1st number: 80/90, 2nd number: 3 0/20
80/90 - 60/20 is -19/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
80/90 = 80 × 2/90 × 2 = 160/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
60/20 = 60 × 9/20 × 9 = 540/180 - Subtract the two like fractions:
160/180 - 540/180 = 160 - 540/180 = -380/180 - After reducing the fraction, the answer is -19/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90-60/40