Subtract 70/90 from 42/7
1st number: 6 0/7, 2nd number: 70/90
42/7 - 70/90 is 47/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
42/7 = 42 × 90/7 × 90 = 3780/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
70/90 = 70 × 7/90 × 7 = 490/630 - Subtract the two like fractions:
3780/630 - 490/630 = 3780 - 490/630 = 3290/630 - After reducing the fraction, the answer is 47/9
- In mixed form: 52/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/7-70/90 42/14-70/90 42/21-70/90 42/35-70/90 42/49-70/90