Subtract 60/45 from 80/70
1st number: 1 10/70, 2nd number: 1 15/45
80/70 - 60/45 is -4/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
80/70 = 80 × 9/70 × 9 = 720/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
60/45 = 60 × 14/45 × 14 = 840/630 - Subtract the two like fractions:
720/630 - 840/630 = 720 - 840/630 = -120/630 - After reducing the fraction, the answer is -4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70-60/90