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