Basic Math Examples

3

$3$ ,

6

$6$ ,

9

$9$ ,

12

$12$

Step 1

The mean of a set of numbers is the sum divided by the number of terms.

\frac{3 + 6 + 9 + 12}{4}

$\frac{3 + 6 + 9 + 12}{4}$

Step 2

Simplify the numerator.

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Step 2.1

Add

3

$3$ and

6

$6$ .

\frac{9 + 9 + 12}{4}

$\frac{9 + 9 + 12}{4}$

Step 2.2

Add

9

$9$ and

9

$9$ .

\frac{18 + 12}{4}

$\frac{18 + 12}{4}$

Step 2.3

Add

18

$18$ and

12

$12$ .

\frac{30}{4}

$\frac{30}{4}$

\frac{30}{4}

$\frac{30}{4}$

Step 3

Cancel the common factor of

30

$30$ and

4

$4$ .

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Step 3.1

Factor

2

$2$ out of

30

$30$ .

\frac{2 (15)}{4}

$\frac{2 (15)}{4}$

Step 3.2

Cancel the common factors.

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Step 3.2.1

Factor

2

$2$ out of

4

$4$ .

\frac{2 \cdot 15}{2 \cdot 2}

$\frac{2 \cdot 15}{2 \cdot 2}$

Step 3.2.2

Cancel the common factor.

$\frac{2 \cdot 15}{2 \cdot 2}$

Step 3.2.3

Rewrite the expression.

$\frac{15}{2}$

Step 4

Divide.

$7.5$