Add 9/15 and 20/70
9/15 + 20/70 is 31/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
9/15 = 9 × 14/15 × 14 = 126/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
20/70 = 20 × 3/70 × 3 = 60/210 - Add the two like fractions:
126/210 + 60/210 = 126 + 60/210 = 186/210 - 186/210 simplified gives 31/35
- So, 9/15 + 20/70 = 31/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15+20/70 9/15+40/70 9/30+20/70 27/15+20/70 9/15+60/70 9/45+20/70 45/15+20/70 9/75+20/70 63/15+20/70