Subtract 63/40 from 80/84
1st number: 80/84, 2nd number: 1 23/40
80/84 - 63/40 is -523/840.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
80/84 = 80 × 10/84 × 10 = 800/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
63/40 = 63 × 21/40 × 21 = 1323/840 - Subtract the two like fractions:
800/840 - 1323/840 = 800 - 1323/840 = -523/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-63/80