Subtract 21/40 from 90/6
1st number: 15 0/6, 2nd number: 21/40
90/6 - 21/40 is 579/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 6 × 20 = 120,
90/6 = 90 × 20/6 × 20 = 1800/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Subtract the two like fractions:
1800/120 - 63/120 = 1800 - 63/120 = 1737/120 - After reducing the fraction, the answer is 579/40
- In mixed form: 1419/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/6-42/40 90/12-21/40 90/6-21/80 90/6-63/40 90/18-21/40 90/30-21/40 90/42-21/40