Subtract 49/80 from 40/70
40/70 - 49/80 is -23/560.
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,
40/70 = 40 × 8/70 × 8 = 320/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
49/80 = 49 × 7/80 × 7 = 343/560 - Subtract the two like fractions:
320/560 - 343/560 = 320 - 343/560 = -23/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70-49/80 40/70-98/80