Subtract 42/16 from 28/18
1st number: 1 10/18, 2nd number: 2 10/16
28/18 - 42/16 is -77/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 16 is 144
Next, find the equivalent fraction of both fractional numbers with denominator 144 - For the 1st fraction, since 18 × 8 = 144,
28/18 = 28 × 8/18 × 8 = 224/144 - Likewise, for the 2nd fraction, since 16 × 9 = 144,
42/16 = 42 × 9/16 × 9 = 378/144 - Subtract the two like fractions:
224/144 - 378/144 = 224 - 378/144 = -154/144 - After reducing the fraction, the answer is -77/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18-42/16 28/18-84/16 28/36-42/16 28/18-42/32 84/18-42/16 28/54-42/16 28/18-42/48 28/90-42/16 28/18-42/80