Subtract 28/7 from 9/90
1st number: 9/90, 2nd number: 4 0/7
9/90 - 28/7 is -39/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
9/90 = 9 × 7/90 × 7 = 63/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
28/7 = 28 × 90/7 × 90 = 2520/630 - Subtract the two like fractions:
63/630 - 2520/630 = 63 - 2520/630 = -2457/630 - After reducing the fraction, the answer is -39/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/90-28/7 9/90-56/7 9/90-28/14 27/90-28/7 9/90-84/7 9/90-28/21 45/90-28/7 9/90-28/35 63/90-28/7 9/90-28/49