Add 90/84 and 45/12
1st number: 1 6/84, 2nd number: 3 9/12
90/84 + 45/12 is 135/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
90/84 = 90 × 1/84 × 1 = 90/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Add the two like fractions:
90/84 + 315/84 = 90 + 315/84 = 405/84 - 405/84 simplified gives 135/28
- So, 90/84 + 45/12 = 135/28
In mixed form: 423/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84+90/12 90/84+45/24 90/84+45/36 90/84+45/60 90/84+45/84