Add 1/21 and 20/70
1/21 + 20/70 is 1/3.
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,
1/21 = 1 × 10/21 × 10 = 10/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
20/70 = 20 × 3/70 × 3 = 60/210 - Add the two like fractions:
10/210 + 60/210 = 10 + 60/210 = 70/210 - 70/210 simplified gives 1/3
- So, 1/21 + 20/70 = 1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+20/70 1/21+40/70 1/42+20/70 3/21+20/70 1/21+60/70 1/63+20/70 5/21+20/70 7/21+20/70