Subtract 42/80 from 15/2
1st number: 7 1/2, 2nd number: 42/80
15/2 - 42/80 is 279/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 2 × 40 = 80,
15/2 = 15 × 40/2 × 40 = 600/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Subtract the two like fractions:
600/80 - 42/80 = 600 - 42/80 = 558/80 - After reducing the fraction, the answer is 279/40
- In mixed form: 639/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/2-42/80 15/2-84/80 15/4-42/80 45/2-42/80 15/6-42/80 75/2-42/80 15/10-42/80 15/14-42/80