Add 3/42 and 8/20
3/42 + 8/20 is 33/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
3/42 = 3 × 10/42 × 10 = 30/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
8/20 = 8 × 21/20 × 21 = 168/420 - Add the two like fractions:
30/420 + 168/420 = 30 + 168/420 = 198/420 - 198/420 simplified gives 33/70
- So, 3/42 + 8/20 = 33/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42+8/20 3/42+16/20 3/84+8/20 3/42+8/40 9/42+8/20 3/42+24/20 3/42+8/60 15/42+8/20 3/42+40/20 21/42+8/20 3/42+56/20