Subtract 84/9 from 90/40
1st number: 2 10/40, 2nd number: 9 3/9
90/40 - 84/9 is -85/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
90/40 = 90 × 9/40 × 9 = 810/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
84/9 = 84 × 40/9 × 40 = 3360/360 - Subtract the two like fractions:
810/360 - 3360/360 = 810 - 3360/360 = -2550/360 - After reducing the fraction, the answer is -85/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80-84/9 90/40-84/18 90/40-84/27 90/40-84/45 90/40-84/63