Subtract 42/80 from 70/45
1st number: 1 25/45, 2nd number: 42/80
70/45 - 42/80 is 371/360.
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,
70/45 = 70 × 16/45 × 16 = 1120/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Subtract the two like fractions:
1120/720 - 378/720 = 1120 - 378/720 = 742/720 - After reducing the fraction, the answer is 371/360
- In mixed form: 111/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/45-84/80 70/90-42/80