Subtract 40/8 from 80/18
1st number: 4 8/18, 2nd number: 5 0/8
80/18 - 40/8 is -5/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
80/18 = 80 × 4/18 × 4 = 320/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
40/8 = 40 × 9/8 × 9 = 360/72 - Subtract the two like fractions:
320/72 - 360/72 = 320 - 360/72 = -40/72 - After reducing the fraction, the answer is -5/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/18-80/8 80/36-40/8 80/18-40/16 80/54-40/8 80/18-40/24 80/90-40/8 80/18-40/56