Add 84/28 and 90/42
1st number: 3 0/28, 2nd number: 2 6/42
84/28 + 90/42 is 36/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
84/28 = 84 × 3/28 × 3 = 252/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
90/42 = 90 × 2/42 × 2 = 180/84 - Add the two like fractions:
252/84 + 180/84 = 252 + 180/84 = 432/84 - 432/84 simplified gives 36/7
- So, 84/28 + 90/42 = 36/7
In mixed form: 51/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56+90/42 84/28+90/84