Subtract 1/45 from 81/30
1st number: 2 21/30, 2nd number: 1/45
81/30 - 1/45 is 241/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 45 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 45 × 2 = 90,
1/45 = 1 × 2/45 × 2 = 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: 81/30-2/45 81/60-1/45 81/30-1/90 81/30-3/45 81/90-1/45 81/30-5/45 81/30-7/45