Add 42/45 and 4/12
42/45 + 4/12 is 19/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
42/45 = 42 × 4/45 × 4 = 168/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
4/12 = 4 × 15/12 × 15 = 60/180 - Add the two like fractions:
168/180 + 60/180 = 168 + 60/180 = 228/180 - 228/180 simplified gives 19/15
- So, 42/45 + 4/12 = 19/15
In mixed form: 14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45+4/12 42/45+8/12 42/90+4/12 42/45+4/24 42/45+4/36 42/45+20/12 42/45+4/60 42/45+28/12 42/45+4/84