Subtract 5/9 from 21/70
21/70 - 5/9 is -23/90.
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,
21/70 = 21 × 9/70 × 9 = 189/630 - Likewise, for the 2nd fraction, since 9 × 70 = 630,
5/9 = 5 × 70/9 × 70 = 350/630 - Subtract the two like fractions:
189/630 - 350/630 = 189 - 350/630 = -161/630 - After reducing the fraction, the answer is -23/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-5/9 21/70-10/9 21/70-5/18 63/70-5/9 21/70-15/9 21/70-5/27 21/70-25/9 21/70-5/45 21/70-35/9 21/70-5/63