Subtract 80/21 from 40/9
1st number: 4 4/9, 2nd number: 3 17/21
40/9 - 80/21 is 40/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
40/9 = 40 × 7/9 × 7 = 280/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
80/21 = 80 × 3/21 × 3 = 240/63 - Subtract the two like fractions:
280/63 - 240/63 = 280 - 240/63 = 40/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/9-80/21 40/18-80/21 40/9-80/42 40/27-80/21 40/9-80/63 40/45-80/21 40/63-80/21