Subtract 18/20 from 45/8
1st number: 5 5/8, 2nd number: 18/20
45/8 - 18/20 is 189/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 20 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
45/8 = 45 × 5/8 × 5 = 225/40 - Likewise, for the 2nd fraction, since 20 × 2 = 40,
18/20 = 18 × 2/20 × 2 = 36/40 - Subtract the two like fractions:
225/40 - 36/40 = 225 - 36/40 = 189/40 - In mixed form: 429/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8-18/20 45/8-36/20 45/16-18/20 45/8-18/40 45/8-54/20 45/24-18/20 45/8-18/60 45/8-90/20 45/40-18/20 45/56-18/20