Add 12/84 and 90/9
1st number: 12/84, 2nd number: 10 0/9
12/84 + 90/9 is 71/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
12/84 = 12 × 3/84 × 3 = 36/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
90/9 = 90 × 28/9 × 28 = 2520/252 - Add the two like fractions:
36/252 + 2520/252 = 36 + 2520/252 = 2556/252 - 2556/252 simplified gives 71/7
- So, 12/84 + 90/9 = 71/7
In mixed form: 101/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/84+90/9 12/84+90/18 36/84+90/9 12/84+90/27 60/84+90/9 12/84+90/45 12/84+90/63