Subtract 70/80 from 4/9
4/9 - 70/80 is -31/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 9 × 80 = 720,
4/9 = 4 × 80/9 × 80 = 320/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
70/80 = 70 × 9/80 × 9 = 630/720 - Subtract the two like fractions:
320/720 - 630/720 = 320 - 630/720 = -310/720 - After reducing the fraction, the answer is -31/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/9-70/80 4/18-70/80 12/9-70/80 4/27-70/80 20/9-70/80 4/45-70/80 28/9-70/80 4/63-70/80