Subtract 7/70 from 20/80
20/80 - 7/70 is 3/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
20/80 = 20 × 7/80 × 7 = 140/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
7/70 = 7 × 8/70 × 8 = 56/560 - Subtract the two like fractions:
140/560 - 56/560 = 140 - 56/560 = 84/560 - After reducing the fraction, the answer is 3/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80-7/70 20/80-14/70 60/80-7/70 20/80-21/70 20/80-35/70 20/80-49/70