Subtract 21/90 from 1/4
1/4 - 21/90 is 1/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
1/4 = 1 × 45/4 × 45 = 45/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Subtract the two like fractions:
45/180 - 42/180 = 45 - 42/180 = 3/180 - After reducing the fraction, the answer is 1/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/4-21/90 1/4-42/90 1/8-21/90 3/4-21/90 1/4-63/90 1/12-21/90 5/4-21/90 1/20-21/90 7/4-21/90 1/28-21/90