Subtract 64/21 from 16/12
1st number: 1 4/12, 2nd number: 3 1/21
16/12 - 64/21 is -12/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
16/12 = 16 × 7/12 × 7 = 112/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
64/21 = 64 × 4/21 × 4 = 256/84 - Subtract the two like fractions:
112/84 - 256/84 = 112 - 256/84 = -144/84 - After reducing the fraction, the answer is -12/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/12-64/21 16/24-64/21 16/12-64/42 48/12-64/21 16/36-64/21 16/12-64/63 80/12-64/21 16/60-64/21 16/84-64/21