Subtract 30/90 from 15/7
1st number: 2 1/7, 2nd number: 30/90
15/7 - 30/90 is 38/21.
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,
15/7 = 15 × 90/7 × 90 = 1350/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Subtract the two like fractions:
1350/630 - 210/630 = 1350 - 210/630 = 1140/630 - After reducing the fraction, the answer is 38/21
- In mixed form: 117/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/7-30/90 15/7-60/90 15/14-30/90 45/7-30/90 15/21-30/90 75/7-30/90 15/35-30/90 15/49-30/90