Subtract 81/28 from 42/16
1st number: 2 10/16, 2nd number: 2 25/28
42/16 - 81/28 is -15/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 28 is 112
Next, find the equivalent fraction of both fractional numbers with denominator 112 - For the 1st fraction, since 16 × 7 = 112,
42/16 = 42 × 7/16 × 7 = 294/112 - Likewise, for the 2nd fraction, since 28 × 4 = 112,
81/28 = 81 × 4/28 × 4 = 324/112 - Subtract the two like fractions:
294/112 - 324/112 = 294 - 324/112 = -30/112 - After reducing the fraction, the answer is -15/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/16-81/28 42/32-81/28 42/16-81/56 42/48-81/28 42/16-81/84 42/80-81/28