Subtract 42/9 from 20/70
1st number: 20/70, 2nd number: 4 6/9
20/70 - 42/9 is -92/21.
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,
20/70 = 20 × 9/70 × 9 = 180/630 - Likewise, for the 2nd fraction, since 9 × 70 = 630,
42/9 = 42 × 70/9 × 70 = 2940/630 - Subtract the two like fractions:
180/630 - 2940/630 = 180 - 2940/630 = -2760/630 - After reducing the fraction, the answer is -92/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-42/9 20/70-84/9 20/70-42/18 60/70-42/9 20/70-42/27 20/70-42/45 20/70-42/63