Subtract 21/72 from 90/40
1st number: 2 10/40, 2nd number: 21/72
90/40 - 21/72 is 47/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 72 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 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Subtract the two like fractions:
810/360 - 105/360 = 810 - 105/360 = 705/360 - After reducing the fraction, the answer is 47/24
- In mixed form: 123/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40-42/72 90/80-21/72 90/40-63/72