Subtract 1/45 from 21/70
21/70 - 1/45 is 5/18.
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,
1/45 = 1 × 14/45 × 14 = 14/630 - Subtract the two like fractions:
189/630 - 14/630 = 189 - 14/630 = 175/630 - After reducing the fraction, the answer is 5/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-1/45 21/70-2/45 21/70-1/90 63/70-1/45 21/70-3/45 21/70-5/45 21/70-7/45