Subtract 3/9 from 40/70
40/70 - 3/9 is 5/21.
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,
40/70 = 40 × 9/70 × 9 = 360/630 - Likewise, for the 2nd fraction, since 9 × 70 = 630,
3/9 = 3 × 70/9 × 70 = 210/630 - Subtract the two like fractions:
360/630 - 210/630 = 360 - 210/630 = 150/630 - After reducing the fraction, the answer is 5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70-3/9 40/70-6/9 40/70-3/18 40/70-3/27 40/70-15/9 40/70-3/45 40/70-21/9 40/70-3/63