Add 42/84 and 90/9
1st number: 42/84, 2nd number: 10 0/9
42/84 + 90/9 is 21/2.
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,
42/84 = 42 × 3/84 × 3 = 126/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
90/9 = 90 × 28/9 × 28 = 2520/252 - Add the two like fractions:
126/252 + 2520/252 = 126 + 2520/252 = 2646/252 - 2646/252 simplified gives 21/2
- So, 42/84 + 90/9 = 21/2
In mixed form: 101/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+90/18 42/84+90/27 42/84+90/45 42/84+90/63