Subtract 21/70 from 70/45
1st number: 1 25/45, 2nd number: 21/70
70/45 - 21/70 is 113/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
70/45 = 70 × 14/45 × 14 = 980/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630 - Subtract the two like fractions:
980/630 - 189/630 = 980 - 189/630 = 791/630 - After reducing the fraction, the answer is 113/90
- In mixed form: 123/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/45-42/70 70/90-21/70 70/45-63/70