Add 84/18 and 90/28
1st number: 4 12/18, 2nd number: 3 6/28
84/18 + 90/28 is 331/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 18 × 14 = 252,
84/18 = 84 × 14/18 × 14 = 1176/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
90/28 = 90 × 9/28 × 9 = 810/252 - Add the two like fractions:
1176/252 + 810/252 = 1176 + 810/252 = 1986/252 - 1986/252 simplified gives 331/42
- So, 84/18 + 90/28 = 331/42
In mixed form: 737/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/36+90/28 84/18+90/56 84/54+90/28 84/18+90/84 84/90+90/28