Add 3/9 and 20/70
3/9 + 20/70 is 13/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 9 × 70 = 630,
3/9 = 3 × 70/9 × 70 = 210/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
20/70 = 20 × 9/70 × 9 = 180/630 - Add the two like fractions:
210/630 + 180/630 = 210 + 180/630 = 390/630 - 390/630 simplified gives 13/21
- So, 3/9 + 20/70 = 13/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/9+20/70 3/9+40/70 3/18+20/70 3/9+60/70 3/27+20/70 15/9+20/70 3/45+20/70 21/9+20/70 3/63+20/70