Subtract 63/80 from 42/40
1st number: 1 2/40, 2nd number: 63/80
42/40 - 63/80 is 21/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 40 × 2 = 80,
42/40 = 42 × 2/40 × 2 = 84/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
63/80 = 63 × 1/80 × 1 = 63/80 - Subtract the two like fractions:
84/80 - 63/80 = 84 - 63/80 = 21/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40-63/80 42/80-63/80