Subtract 45/7 from 28/90
1st number: 28/90, 2nd number: 6 3/7
28/90 - 45/7 is -1927/315.
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,
28/90 = 28 × 7/90 × 7 = 196/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
45/7 = 45 × 90/7 × 90 = 4050/630 - Subtract the two like fractions:
196/630 - 4050/630 = 196 - 4050/630 = -3854/630 - After reducing the fraction, the answer is -1927/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-45/7 28/90-90/7 28/90-45/14 84/90-45/7 28/90-45/21 28/90-45/35 28/90-45/49