Add 3/42 and 20/8
1st number: 3/42, 2nd number: 2 4/8
3/42 + 20/8 is 18/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
3/42 = 3 × 4/42 × 4 = 12/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
20/8 = 20 × 21/8 × 21 = 420/168 - Add the two like fractions:
12/168 + 420/168 = 12 + 420/168 = 432/168 - 432/168 simplified gives 18/7
- So, 3/42 + 20/8 = 18/7
In mixed form: 24/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42+20/8 3/42+40/8 3/84+20/8 3/42+20/16 9/42+20/8 3/42+60/8 3/42+20/24 15/42+20/8 3/42+20/40 21/42+20/8 3/42+20/56