Subtract 45/90 from 20/7
1st number: 2 6/7, 2nd number: 45/90
20/7 - 45/90 is 33/14.
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,
20/7 = 20 × 90/7 × 90 = 1800/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
45/90 = 45 × 7/90 × 7 = 315/630 - Subtract the two like fractions:
1800/630 - 315/630 = 1800 - 315/630 = 1485/630 - After reducing the fraction, the answer is 33/14
- In mixed form: 25/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/7-45/90 20/14-45/90 60/7-45/90 20/21-45/90 20/35-45/90 20/49-45/90