Subtract 10/90 from 15/40
15/40 - 10/90 is 19/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
15/40 = 15 × 9/40 × 9 = 135/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
10/90 = 10 × 4/90 × 4 = 40/360 - Subtract the two like fractions:
135/360 - 40/360 = 135 - 40/360 = 95/360 - After reducing the fraction, the answer is 19/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40-10/90 15/40-20/90 15/80-10/90 45/40-10/90 15/40-30/90 75/40-10/90 15/40-50/90 15/40-70/90