Subtract 20/70 from 15/9
1st number: 1 6/9, 2nd number: 20/70
15/9 - 20/70 is 29/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 9 × 70 = 630,
15/9 = 15 × 70/9 × 70 = 1050/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
20/70 = 20 × 9/70 × 9 = 180/630 - Subtract the two like fractions:
1050/630 - 180/630 = 1050 - 180/630 = 870/630 - After reducing the fraction, the answer is 29/21
- In mixed form: 18/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/9-20/70 15/9-40/70 15/18-20/70 45/9-20/70 15/9-60/70 15/27-20/70 75/9-20/70 15/45-20/70 15/63-20/70