Subtract 30/9 from 15/40
1st number: 15/40, 2nd number: 3 3/9
15/40 - 30/9 is -71/24.
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,
15/40 = 15 × 9/40 × 9 = 135/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
30/9 = 30 × 40/9 × 40 = 1200/360 - Subtract the two like fractions:
135/360 - 1200/360 = 135 - 1200/360 = -1065/360 - After reducing the fraction, the answer is -71/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40-30/9 15/40-60/9 15/80-30/9 15/40-30/18 45/40-30/9 15/40-90/9 15/40-30/27 75/40-30/9 15/40-30/45 15/40-30/63