Subtract 3/21 from 4/9
4/9 - 3/21 is 19/63.
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,
4/9 = 4 × 7/9 × 7 = 28/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
3/21 = 3 × 3/21 × 3 = 9/63 - Subtract the two like fractions:
28/63 - 9/63 = 28 - 9/63 = 19/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/9-3/21 4/9-6/21 4/18-3/21 4/9-3/42 12/9-3/21 4/9-9/21 4/27-3/21 4/9-3/63 20/9-3/21 4/9-15/21 4/45-3/21 28/9-3/21 4/63-3/21