Subtract 72/9 from 45/8
1st number: 5 5/8, 2nd number: 8 0/9
45/8 - 72/9 is -19/8.
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,
45/8 = 45 × 9/8 × 9 = 405/72 - Likewise, for the 2nd fraction, since 9 × 8 = 72,
72/9 = 72 × 8/9 × 8 = 576/72 - Subtract the two like fractions:
405/72 - 576/72 = 405 - 576/72 = -171/72 - After reducing the fraction, the answer is -19/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8-72/9 45/16-72/9 45/8-72/18 45/24-72/9 45/8-72/27 45/40-72/9 45/8-72/45 45/56-72/9 45/8-72/63