Add 42/84 and 30/7
1st number: 42/84, 2nd number: 4 2/7
42/84 + 30/7 is 67/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
42/84 = 42 × 1/84 × 1 = 42/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
30/7 = 30 × 12/7 × 12 = 360/84 - Add the two like fractions:
42/84 + 360/84 = 42 + 360/84 = 402/84 - 402/84 simplified gives 67/14
- So, 42/84 + 30/7 = 67/14
In mixed form: 411/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+60/7 42/84+30/14 42/84+90/7 42/84+30/21 42/84+30/35 42/84+30/49