Subtract 30/15 from 42/28
1st number: 1 14/28, 2nd number: 2 0/15
42/28 - 30/15 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
42/28 = 42 × 15/28 × 15 = 630/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
30/15 = 30 × 28/15 × 28 = 840/420 - Subtract the two like fractions:
630/420 - 840/420 = 630 - 840/420 = -210/420 - After reducing the fraction, the answer is -1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/28-30/15 42/28-60/15 42/56-30/15 42/28-90/15 42/84-30/15 42/28-30/45 42/28-30/75