Add 12/21 and 10/70
12/21 + 10/70 is 5/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
12/21 = 12 × 10/21 × 10 = 120/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
10/70 = 10 × 3/70 × 3 = 30/210 - Add the two like fractions:
120/210 + 30/210 = 120 + 30/210 = 150/210 - 150/210 simplified gives 5/7
- So, 12/21 + 10/70 = 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+10/70 12/21+20/70 12/42+10/70 36/21+10/70 12/21+30/70 12/63+10/70 60/21+10/70 12/21+50/70 84/21+10/70