Subtract 3/8 from 90/20
1st number: 4 10/20, 2nd number: 3/8
90/20 - 3/8 is 33/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
90/20 = 90 × 2/20 × 2 = 180/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
3/8 = 3 × 5/8 × 5 = 15/40 - Subtract the two like fractions:
180/40 - 15/40 = 180 - 15/40 = 165/40 - After reducing the fraction, the answer is 33/8
- In mixed form: 41/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20-6/8 90/40-3/8 90/20-3/16 90/20-9/8 90/60-3/8 90/20-3/24 90/20-15/8 90/20-3/40 90/20-21/8 90/20-3/56