Subtract 12/90 from 20/30
20/30 - 12/90 is 8/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
20/30 = 20 × 3/30 × 3 = 60/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
12/90 = 12 × 1/90 × 1 = 12/90 - Subtract the two like fractions:
60/90 - 12/90 = 60 - 12/90 = 48/90 - After reducing the fraction, the answer is 8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-12/90 20/30-24/90 20/60-12/90 60/30-12/90 20/30-36/90 20/90-12/90 20/30-60/90 20/30-84/90