Subtract 21/90 from 2/5
2/5 - 21/90 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
2/5 = 2 × 18/5 × 18 = 36/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Subtract the two like fractions:
36/90 - 21/90 = 36 - 21/90 = 15/90 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/5-21/90 2/5-42/90 2/10-21/90 6/5-21/90 2/5-63/90 2/15-21/90 10/5-21/90 2/25-21/90 14/5-21/90 2/35-21/90