Subtract 9/80 from 20/30
20/30 - 9/80 is 133/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 30 × 8 = 240,
20/30 = 20 × 8/30 × 8 = 160/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
9/80 = 9 × 3/80 × 3 = 27/240 - Subtract the two like fractions:
160/240 - 27/240 = 160 - 27/240 = 133/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-9/80 20/30-18/80 20/60-9/80 60/30-9/80 20/30-27/80 20/90-9/80 20/30-45/80 20/30-63/80