Subtract 27/70 from 30/80
30/80 - 27/70 is -3/280.
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,
30/80 = 30 × 7/80 × 7 = 210/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
27/70 = 27 × 8/70 × 8 = 216/560 - Subtract the two like fractions:
210/560 - 216/560 = 210 - 216/560 = -6/560 - After reducing the fraction, the answer is -3/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80-27/70 30/80-54/70 90/80-27/70 30/80-81/70