Subtract 32/90 from 21/75
21/75 - 32/90 is -17/225.
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,
32/90 = 32 × 5/90 × 5 = 160/450 - Subtract the two like fractions:
126/450 - 160/450 = 126 - 160/450 = -34/450 - After reducing the fraction, the answer is -17/225
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-32/90 21/75-64/90 63/75-32/90 21/75-96/90