Subtract 40/9 from 30/8
1st number: 3 6/8, 2nd number: 4 4/9
30/8 - 40/9 is -25/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 9 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
30/8 = 30 × 9/8 × 9 = 270/72 - Likewise, for the 2nd fraction, since 9 × 8 = 72,
40/9 = 40 × 8/9 × 8 = 320/72 - Subtract the two like fractions:
270/72 - 320/72 = 270 - 320/72 = -50/72 - After reducing the fraction, the answer is -25/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/8-40/9 30/8-80/9 30/16-40/9 30/8-40/18 90/8-40/9 30/24-40/9 30/8-40/27 30/40-40/9 30/8-40/45 30/56-40/9 30/8-40/63