Add 42/12 and 45/90
1st number: 3 6/12, 2nd number: 45/90
42/12 + 45/90 is 4/1.
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,
42/12 = 42 × 15/12 × 15 = 630/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
45/90 = 45 × 2/90 × 2 = 90/180 - Add the two like fractions:
630/180 + 90/180 = 630 + 90/180 = 720/180 - 720/180 simplified gives 4/1
- So, 42/12 + 45/90 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+45/90 42/24+45/90 42/36+45/90 42/60+45/90 42/84+45/90