Subtract 20/90 from 28/30
28/30 - 20/90 is 32/45.
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,
28/30 = 28 × 3/30 × 3 = 84/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Subtract the two like fractions:
84/90 - 20/90 = 84 - 20/90 = 64/90 - After reducing the fraction, the answer is 32/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/30-20/90 28/30-40/90 28/60-20/90 84/30-20/90 28/30-60/90 28/90-20/90