Add 21/42 and 14/70
21/42 + 14/70 is 7/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
14/70 = 14 × 3/70 × 3 = 42/210 - Add the two like fractions:
105/210 + 42/210 = 105 + 42/210 = 147/210 - 147/210 simplified gives 7/10
- So, 21/42 + 14/70 = 7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+28/70 21/84+14/70 63/42+14/70 21/42+42/70 21/42+98/70