Add 4/12 and 42/90
4/12 + 42/90 is 4/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
4/12 = 4 × 15/12 × 15 = 60/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
42/90 = 42 × 2/90 × 2 = 84/180 - Add the two like fractions:
60/180 + 84/180 = 60 + 84/180 = 144/180 - 144/180 simplified gives 4/5
- So, 4/12 + 42/90 = 4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12+42/90 4/12+84/90 4/24+42/90 4/36+42/90 20/12+42/90 4/60+42/90 28/12+42/90 4/84+42/90