Add 5/42 and 8/20
5/42 + 8/20 is 109/210.
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,
5/42 = 5 × 10/42 × 10 = 50/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
8/20 = 8 × 21/20 × 21 = 168/420 - Add the two like fractions:
50/420 + 168/420 = 50 + 168/420 = 218/420 - 218/420 simplified gives 109/210
- So, 5/42 + 8/20 = 109/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/42+8/20 5/42+16/20 5/84+8/20 5/42+8/40 15/42+8/20 5/42+24/20 5/42+8/60 25/42+8/20 5/42+40/20 35/42+8/20 5/42+56/20