Subtract 4/21 from 18/9
1st number: 2 0/9, 2nd number: 4/21
18/9 - 4/21 is 38/21.
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,
18/9 = 18 × 7/9 × 7 = 126/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
4/21 = 4 × 3/21 × 3 = 12/63 - Subtract the two like fractions:
126/63 - 12/63 = 126 - 12/63 = 114/63 - After reducing the fraction, the answer is 38/21
- In mixed form: 117/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/9-4/21 18/9-8/21 18/9-4/42 54/9-4/21 18/9-12/21 18/27-4/21 18/9-4/63 90/9-4/21 18/9-20/21 18/45-4/21 18/9-28/21 18/63-4/21