Subtract 5/90 from 21/75
21/75 - 5/90 is 101/450.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 75 × 6 = 450,
21/75 = 21 × 6/75 × 6 = 126/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
5/90 = 5 × 5/90 × 5 = 25/450 - Subtract the two like fractions:
126/450 - 25/450 = 126 - 25/450 = 101/450
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-5/90 21/75-10/90 63/75-5/90 21/75-15/90 21/75-25/90 21/75-35/90