Subtract 8/32 from 4/21
4/21 - 8/32 is -5/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 32 is 672
Next, find the equivalent fraction of both fractional numbers with denominator 672 - For the 1st fraction, since 21 × 32 = 672,
4/21 = 4 × 32/21 × 32 = 128/672 - Likewise, for the 2nd fraction, since 32 × 21 = 672,
8/32 = 8 × 21/32 × 21 = 168/672 - Subtract the two like fractions:
128/672 - 168/672 = 128 - 168/672 = -40/672 - After reducing the fraction, the answer is -5/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-8/32 4/21-16/32 4/42-8/32 4/21-8/64 12/21-8/32 4/21-24/32 4/63-8/32 4/21-8/96 20/21-8/32 4/21-40/32 28/21-8/32 4/21-56/32