Subtract 16/90 from 12/80
12/80 - 16/90 is -1/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
12/80 = 12 × 9/80 × 9 = 108/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
16/90 = 16 × 8/90 × 8 = 128/720 - Subtract the two like fractions:
108/720 - 128/720 = 108 - 128/720 = -20/720 - After reducing the fraction, the answer is -1/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/80-16/90 12/80-32/90 36/80-16/90 12/80-48/90 60/80-16/90 12/80-80/90 84/80-16/90