Subtract 18/5 from 30/20
1st number: 1 10/20, 2nd number: 3 3/5
30/20 - 18/5 is -21/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
30/20 = 30 × 1/20 × 1 = 30/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
18/5 = 18 × 4/5 × 4 = 72/20 - Subtract the two like fractions:
30/20 - 72/20 = 30 - 72/20 = -42/20 - After reducing the fraction, the answer is -21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20-18/5 30/20-36/5 30/40-18/5 30/20-18/10 90/20-18/5 30/20-54/5 30/60-18/5 30/20-18/15 30/20-90/5 30/20-18/25 30/20-18/35