Subtract 21/30 from 90/75
1st number: 1 15/75, 2nd number: 21/30
90/75 - 21/30 is 1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 30 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 75 × 2 = 150,
90/75 = 90 × 2/75 × 2 = 180/150 - Likewise, for the 2nd fraction, since 30 × 5 = 150,
21/30 = 21 × 5/30 × 5 = 105/150 - Subtract the two like fractions:
180/150 - 105/150 = 180 - 105/150 = 75/150 - After reducing the fraction, the answer is 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75-42/30 90/75-21/60 90/75-63/30 90/75-21/90