Subtract 1/40 from 90/9
1st number: 10 0/9, 2nd number: 1/40
90/9 - 1/40 is 399/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 9 × 40 = 360,
90/9 = 90 × 40/9 × 40 = 3600/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
1/40 = 1 × 9/40 × 9 = 9/360 - Subtract the two like fractions:
3600/360 - 9/360 = 3600 - 9/360 = 3591/360 - After reducing the fraction, the answer is 399/40
- In mixed form: 939/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/9-2/40 90/18-1/40 90/9-1/80 90/9-3/40 90/27-1/40 90/9-5/40 90/45-1/40 90/9-7/40 90/63-1/40