Subtract 1/90 from 18/7
1st number: 2 4/7, 2nd number: 1/90
18/7 - 1/90 is 1613/630.
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,
18/7 = 18 × 90/7 × 90 = 1620/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
1/90 = 1 × 7/90 × 7 = 7/630 - Subtract the two like fractions:
1620/630 - 7/630 = 1620 - 7/630 = 1613/630 - In mixed form: 2353/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7-1/90 18/7-2/90 18/14-1/90 54/7-1/90 18/7-3/90 18/21-1/90 90/7-1/90 18/7-5/90 18/35-1/90 18/7-7/90 18/49-1/90