Subtract 3/90 from 30/80
30/80 - 3/90 is 41/120.
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,
30/80 = 30 × 9/80 × 9 = 270/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
3/90 = 3 × 8/90 × 8 = 24/720 - Subtract the two like fractions:
270/720 - 24/720 = 270 - 24/720 = 246/720 - After reducing the fraction, the answer is 41/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80-3/90 30/80-6/90 90/80-3/90 30/80-9/90 30/80-15/90 30/80-21/90