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To find the common denominator of each fraction 

1/6 --- 6,12,18,24,

1/9 --- 9, 18 , 27 and so on...

The common denominator is 18.

The common denominator of the two fractions will be 18.

Given to us

  • [tex]\dfrac{1}{6}[/tex]
  • [tex]\dfrac{1}{9}[/tex]

To find

The Common denominator of  [tex]\dfrac{1}{6}[/tex]  and  [tex]\dfrac{1}{9}[/tex].

Solution

To find the common denominator between any two fractions we need to find the LCM of the two denominators.

2 | 6, 9

3 | 3, 9

3 | 1, 3

  | 1, 1

therefore, the LCM of the two numbers will be [tex]2 \times 3\times3 =18[/tex].

As we can see that the LCM of the two fractions is 18.

[tex]\dfrac{1}{6}+\dfrac{1}{9}\\\\=\dfrac{1\times 3}{6\times 3}+\dfrac{1\times 2}{9 \times 2}\\\\=\dfrac{3+2}{18}\\\\=\dfrac{5}{18}[/tex]

Thus, the common denominator will be 18.

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