Subtract 42/8 from 45/9
1st number: 5 0/9, 2nd number: 5 2/8
45/9 - 42/8 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 9 × 8 = 72,
45/9 = 45 × 8/9 × 8 = 360/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
42/8 = 42 × 9/8 × 9 = 378/72 - Subtract the two like fractions:
360/72 - 378/72 = 360 - 378/72 = -18/72 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/9-42/8 45/9-84/8 45/18-42/8 45/9-42/16 45/27-42/8 45/9-42/24 45/9-42/40 45/63-42/8 45/9-42/56