Add 3/21 and 2/20
3/21 + 2/20 is 17/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
3/21 = 3 × 20/21 × 20 = 60/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
2/20 = 2 × 21/20 × 21 = 42/420 - Add the two like fractions:
60/420 + 42/420 = 60 + 42/420 = 102/420 - 102/420 simplified gives 17/70
- So, 3/21 + 2/20 = 17/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+2/20 3/21+4/20 3/42+2/20 3/21+2/40 9/21+2/20 3/21+6/20 3/63+2/20 3/21+2/60 15/21+2/20 3/21+10/20 3/21+14/20