Subtract 27/21 from 80/9
1st number: 8 8/9, 2nd number: 1 6/21
80/9 - 27/21 is 479/63.
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,
80/9 = 80 × 7/9 × 7 = 560/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
27/21 = 27 × 3/21 × 3 = 81/63 - Subtract the two like fractions:
560/63 - 81/63 = 560 - 81/63 = 479/63 - In mixed form: 738/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/9-54/21 80/18-27/21 80/9-27/42 80/9-81/21 80/27-27/21 80/9-27/63 80/45-27/21 80/63-27/21