Add 42/45 and 12/18
42/45 + 12/18 is 8/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
42/45 = 42 × 2/45 × 2 = 84/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
12/18 = 12 × 5/18 × 5 = 60/90 - Add the two like fractions:
84/90 + 60/90 = 84 + 60/90 = 144/90 - 144/90 simplified gives 8/5
- So, 42/45 + 12/18 = 8/5
In mixed form: 13/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45+12/18 42/45+24/18 42/90+12/18 42/45+12/36 42/45+36/18 42/45+12/54 42/45+60/18 42/45+12/90 42/45+84/18