Subtract 81/75 from 45/30
1st number: 1 15/30, 2nd number: 1 6/75
45/30 - 81/75 is 21/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 75 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 30 × 5 = 150,
45/30 = 45 × 5/30 × 5 = 225/150 - Likewise, for the 2nd fraction, since 75 × 2 = 150,
81/75 = 81 × 2/75 × 2 = 162/150 - Subtract the two like fractions:
225/150 - 162/150 = 225 - 162/150 = 63/150 - After reducing the fraction, the answer is 21/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30-81/75 45/60-81/75 45/90-81/75