Subtract 1/70 from 20/80
20/80 - 1/70 is 33/140.
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,
1/70 = 1 × 8/70 × 8 = 8/560 - Subtract the two like fractions:
140/560 - 8/560 = 140 - 8/560 = 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: 40/80-1/70 20/80-2/70 60/80-1/70 20/80-3/70 20/80-5/70 20/80-7/70