Subtract 12/9 from 45/70
1st number: 45/70, 2nd number: 1 3/9
45/70 - 12/9 is -29/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 9 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
45/70 = 45 × 9/70 × 9 = 405/630 - Likewise, for the 2nd fraction, since 9 × 70 = 630,
12/9 = 12 × 70/9 × 70 = 840/630 - Subtract the two like fractions:
405/630 - 840/630 = 405 - 840/630 = -435/630 - After reducing the fraction, the answer is -29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-12/9 45/70-24/9 45/70-12/18 45/70-36/9 45/70-12/27 45/70-60/9 45/70-12/45 45/70-84/9 45/70-12/63