Subtract 42/90 from 28/7
1st number: 4 0/7, 2nd number: 42/90
28/7 - 42/90 is 53/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
28/7 = 28 × 90/7 × 90 = 2520/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Subtract the two like fractions:
2520/630 - 294/630 = 2520 - 294/630 = 2226/630 - After reducing the fraction, the answer is 53/15
- In mixed form: 38/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/7-42/90 28/7-84/90 28/14-42/90 84/7-42/90 28/21-42/90 28/35-42/90 28/49-42/90