Add 27/70 and 12/21
27/70 + 12/21 is 67/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
27/70 = 27 × 3/70 × 3 = 81/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
12/21 = 12 × 10/21 × 10 = 120/210 - Add the two like fractions:
81/210 + 120/210 = 81 + 120/210 = 201/210 - 201/210 simplified gives 67/70
- So, 27/70 + 12/21 = 67/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/70+12/21 27/70+24/21 27/70+12/42 81/70+12/21 27/70+36/21 27/70+12/63 27/70+60/21 27/70+84/21