Subtract 18/20 from 45/30
1st number: 1 15/30, 2nd number: 18/20
45/30 - 18/20 is 3/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
45/30 = 45 × 2/30 × 2 = 90/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
18/20 = 18 × 3/20 × 3 = 54/60 - Subtract the two like fractions:
90/60 - 54/60 = 90 - 54/60 = 36/60 - After reducing the fraction, the answer is 3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30-18/20 45/30-36/20 45/60-18/20 45/30-18/40 45/30-54/20 45/90-18/20 45/30-18/60 45/30-90/20