Subtract 48/90 from 21/36
21/36 - 48/90 is 1/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
21/36 = 21 × 5/36 × 5 = 105/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
48/90 = 48 × 2/90 × 2 = 96/180 - Subtract the two like fractions:
105/180 - 96/180 = 105 - 96/180 = 9/180 - After reducing the fraction, the answer is 1/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36-48/90 21/36-96/90 21/72-48/90 63/36-48/90