Add 6/45 and 81/21
1st number: 6/45, 2nd number: 3 18/21
6/45 + 81/21 is 419/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
6/45 = 6 × 7/45 × 7 = 42/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
81/21 = 81 × 15/21 × 15 = 1215/315 - Add the two like fractions:
42/315 + 1215/315 = 42 + 1215/315 = 1257/315 - 1257/315 simplified gives 419/105
- So, 6/45 + 81/21 = 419/105
In mixed form: 3104/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/45+81/21 6/90+81/21 6/45+81/42 18/45+81/21 6/45+81/63 30/45+81/21 42/45+81/21