Subtract 40/21 from 35/9
1st number: 3 8/9, 2nd number: 1 19/21
35/9 - 40/21 is 125/63.
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,
35/9 = 35 × 7/9 × 7 = 245/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
40/21 = 40 × 3/21 × 3 = 120/63 - Subtract the two like fractions:
245/63 - 120/63 = 245 - 120/63 = 125/63 - In mixed form: 162/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/9-40/21 35/9-80/21 35/18-40/21 35/9-40/42 35/27-40/21 35/9-40/63 35/45-40/21 35/63-40/21