Subtract 42/80 from 5/45
5/45 - 42/80 is -149/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
5/45 = 5 × 16/45 × 16 = 80/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Subtract the two like fractions:
80/720 - 378/720 = 80 - 378/720 = -298/720 - After reducing the fraction, the answer is -149/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/45-42/80 5/45-84/80 5/90-42/80 15/45-42/80 25/45-42/80 35/45-42/80