Add 3/90 and 81/12
1st number: 3/90, 2nd number: 6 9/12
3/90 + 81/12 is 407/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
3/90 = 3 × 2/90 × 2 = 6/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
81/12 = 81 × 15/12 × 15 = 1215/180 - Add the two like fractions:
6/180 + 1215/180 = 6 + 1215/180 = 1221/180 - 1221/180 simplified gives 407/60
- So, 3/90 + 81/12 = 407/60
In mixed form: 647/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/90+81/12 3/90+81/24 9/90+81/12 3/90+81/36 15/90+81/12 3/90+81/60 21/90+81/12 3/90+81/84