Add 3/21 and 8/20
3/21 + 8/20 is 19/35.
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,
8/20 = 8 × 21/20 × 21 = 168/420 - Add the two like fractions:
60/420 + 168/420 = 60 + 168/420 = 228/420 - 228/420 simplified gives 19/35
- So, 3/21 + 8/20 = 19/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+8/20 3/21+16/20 3/42+8/20 3/21+8/40 9/21+8/20 3/21+24/20 3/63+8/20 3/21+8/60 15/21+8/20 3/21+40/20 3/21+56/20