Subtract 4/80 from 20/70
20/70 - 4/80 is 33/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
20/70 = 20 × 8/70 × 8 = 160/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
4/80 = 4 × 7/80 × 7 = 28/560 - Subtract the two like fractions:
160/560 - 28/560 = 160 - 28/560 = 132/560 - After reducing the fraction, the answer is 33/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-4/80 20/70-8/80 60/70-4/80 20/70-12/80 20/70-20/80 20/70-28/80