Subtract 6/90 from 21/75
21/75 - 6/90 is 16/75.
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,
6/90 = 6 × 5/90 × 5 = 30/450 - Subtract the two like fractions:
126/450 - 30/450 = 126 - 30/450 = 96/450 - After reducing the fraction, the answer is 16/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-6/90 21/75-12/90 63/75-6/90 21/75-18/90 21/75-30/90 21/75-42/90