Subtract 1/30 from 20/80
20/80 - 1/30 is 13/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 30 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
20/80 = 20 × 3/80 × 3 = 60/240 - Likewise, for the 2nd fraction, since 30 × 8 = 240,
1/30 = 1 × 8/30 × 8 = 8/240 - Subtract the two like fractions:
60/240 - 8/240 = 60 - 8/240 = 52/240 - After reducing the fraction, the answer is 13/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80-1/30 20/80-2/30 20/80-1/60 60/80-1/30 20/80-3/30 20/80-1/90 20/80-5/30 20/80-7/30