Subtract 21/80 from 8/63
8/63 - 21/80 is -683/5040.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 80 is 5040
Next, find the equivalent fraction of both fractional numbers with denominator 5040 - For the 1st fraction, since 63 × 80 = 5040,
8/63 = 8 × 80/63 × 80 = 640/5040 - Likewise, for the 2nd fraction, since 80 × 63 = 5040,
21/80 = 21 × 63/80 × 63 = 1323/5040 - Subtract the two like fractions:
640/5040 - 1323/5040 = 640 - 1323/5040 = -683/5040
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/63-21/80 8/63-42/80 24/63-21/80 8/63-63/80 40/63-21/80 56/63-21/80