Subtract 21/90 from 81/25
1st number: 3 6/25, 2nd number: 21/90
81/25 - 21/90 is 451/150.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 25 × 18 = 450,
81/25 = 81 × 18/25 × 18 = 1458/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
21/90 = 21 × 5/90 × 5 = 105/450 - Subtract the two like fractions:
1458/450 - 105/450 = 1458 - 105/450 = 1353/450 - After reducing the fraction, the answer is 451/150
- In mixed form: 31/150
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/25-42/90 81/50-21/90 81/25-63/90 81/75-21/90