Subtract 7/90 from 45/21
1st number: 2 3/21, 2nd number: 7/90
45/21 - 7/90 is 1301/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
45/21 = 45 × 30/21 × 30 = 1350/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
7/90 = 7 × 7/90 × 7 = 49/630 - Subtract the two like fractions:
1350/630 - 49/630 = 1350 - 49/630 = 1301/630 - In mixed form: 241/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-7/90 45/21-14/90 45/42-7/90 45/21-21/90 45/63-7/90 45/21-35/90 45/21-49/90