Subtract 21/45 from 90/40
1st number: 2 10/40, 2nd number: 21/45
90/40 - 21/45 is 107/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 45 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 45 × 8 = 360,
21/45 = 21 × 8/45 × 8 = 168/360 - Subtract the two like fractions:
810/360 - 168/360 = 810 - 168/360 = 642/360 - After reducing the fraction, the answer is 107/60
- In mixed form: 147/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40-42/45 90/80-21/45 90/40-21/90 90/40-63/45