Subtract 18/8 from 30/80
1st number: 30/80, 2nd number: 2 2/8
30/80 - 18/8 is -15/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 8 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
30/80 = 30 × 1/80 × 1 = 30/80 - Likewise, for the 2nd fraction, since 8 × 10 = 80,
18/8 = 18 × 10/8 × 10 = 180/80 - Subtract the two like fractions:
30/80 - 180/80 = 30 - 180/80 = -150/80 - After reducing the fraction, the answer is -15/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80-18/8 30/80-36/8 30/80-18/16 90/80-18/8 30/80-54/8 30/80-18/24 30/80-90/8 30/80-18/40 30/80-18/56