Add 30/42 and 40/8
1st number: 30/42, 2nd number: 5 0/8
30/42 + 40/8 is 40/7.
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,
30/42 = 30 × 4/42 × 4 = 120/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
40/8 = 40 × 21/8 × 21 = 840/168 - Add the two like fractions:
120/168 + 840/168 = 120 + 840/168 = 960/168 - 960/168 simplified gives 40/7
- So, 30/42 + 40/8 = 40/7
In mixed form: 55/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42+40/8 30/42+80/8 30/84+40/8 30/42+40/16 90/42+40/8 30/42+40/24 30/42+40/56