Subtract 64/9 from 16/21
1st number: 16/21, 2nd number: 7 1/9
16/21 - 64/9 is -400/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
16/21 = 16 × 3/21 × 3 = 48/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
64/9 = 64 × 7/9 × 7 = 448/63 - Subtract the two like fractions:
48/63 - 448/63 = 48 - 448/63 = -400/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21-64/9 16/42-64/9 16/21-64/18 48/21-64/9 16/63-64/9 16/21-64/27 80/21-64/9 16/21-64/45 16/21-64/63