Subtract 75/40 from 90/21
1st number: 4 6/21, 2nd number: 1 35/40
90/21 - 75/40 is 135/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
90/21 = 90 × 40/21 × 40 = 3600/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
75/40 = 75 × 21/40 × 21 = 1575/840 - Subtract the two like fractions:
3600/840 - 1575/840 = 3600 - 1575/840 = 2025/840 - After reducing the fraction, the answer is 135/56
- In mixed form: 223/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-75/40 90/21-75/80 90/63-75/40