Subtract 2/90 from 81/30
1st number: 2 21/30, 2nd number: 2/90
81/30 - 2/90 is 241/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
81/30 = 81 × 3/30 × 3 = 243/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
2/90 = 2 × 1/90 × 1 = 2/90 - Subtract the two like fractions:
243/90 - 2/90 = 243 - 2/90 = 241/90 - In mixed form: 261/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/30-4/90 81/60-2/90 81/30-6/90 81/90-2/90 81/30-10/90 81/30-14/90