Add 20/21 and 2/30
20/21 + 2/30 is 107/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
20/21 = 20 × 10/21 × 10 = 200/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
2/30 = 2 × 7/30 × 7 = 14/210 - Add the two like fractions:
200/210 + 14/210 = 200 + 14/210 = 214/210 - 214/210 simplified gives 107/105
- So, 20/21 + 2/30 = 107/105
In mixed form: 12/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+2/30 20/21+4/30 20/42+2/30 20/21+2/60 60/21+2/30 20/21+6/30 20/63+2/30 20/21+2/90 20/21+10/30 20/21+14/30