Subtract 3/25 from 21/90
21/90 - 3/25 is 17/150.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 25 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 90 × 5 = 450,
21/90 = 21 × 5/90 × 5 = 105/450 - Likewise, for the 2nd fraction, since 25 × 18 = 450,
3/25 = 3 × 18/25 × 18 = 54/450 - Subtract the two like fractions:
105/450 - 54/450 = 105 - 54/450 = 51/450 - After reducing the fraction, the answer is 17/150
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-3/25 21/90-6/25 21/90-3/50 63/90-3/25 21/90-9/25 21/90-3/75 21/90-15/25 21/90-21/25