Subtract 1/36 from 21/90
21/90 - 1/36 is 37/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
1/36 = 1 × 5/36 × 5 = 5/180 - Subtract the two like fractions:
42/180 - 5/180 = 42 - 5/180 = 37/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-1/36 21/90-2/36 21/90-1/72 63/90-1/36 21/90-3/36 21/90-5/36 21/90-7/36