Subtract 30/18 from 20/16
1st number: 1 4/16, 2nd number: 1 12/18
20/16 - 30/18 is -5/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 18 is 144
Next, find the equivalent fraction of both fractional numbers with denominator 144 - For the 1st fraction, since 16 × 9 = 144,
20/16 = 20 × 9/16 × 9 = 180/144 - Likewise, for the 2nd fraction, since 18 × 8 = 144,
30/18 = 30 × 8/18 × 8 = 240/144 - Subtract the two like fractions:
180/144 - 240/144 = 180 - 240/144 = -60/144 - After reducing the fraction, the answer is -5/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/16-30/18 20/16-60/18 20/32-30/18 20/16-30/36 60/16-30/18 20/16-90/18 20/48-30/18 20/16-30/54 20/80-30/18 20/16-30/90