Basic Math Examples

$\frac{2}{3}$ , $\frac{4}{5}$

Step 1

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

$\frac{\frac{2}{3} + \frac{4}{5}}{2}$

Step 2

Simplify the numerator.

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Step 2.1

To write $\frac{2}{3}$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$\frac{\frac{2}{3} \cdot \frac{5}{5} + \frac{4}{5}}{2}$

Step 2.2

To write $\frac{4}{5}$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\frac{\frac{2}{3} \cdot \frac{5}{5} + \frac{4}{5} \cdot \frac{3}{3}}{2}$

Step 2.3

Write each expression with a common denominator of $15$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.3.1

Multiply $\frac{2}{3}$ by $\frac{5}{5}$ .

$\frac{\frac{2 \cdot 5}{3 \cdot 5} + \frac{4}{5} \cdot \frac{3}{3}}{2}$

Step 2.3.2

Multiply $3$ by $5$ .

$\frac{\frac{2 \cdot 5}{15} + \frac{4}{5} \cdot \frac{3}{3}}{2}$

Step 2.3.3

Multiply $\frac{4}{5}$ by $\frac{3}{3}$ .

$\frac{\frac{2 \cdot 5}{15} + \frac{4 \cdot 3}{5 \cdot 3}}{2}$

Step 2.3.4

Multiply $5$ by $3$ .

$\frac{\frac{2 \cdot 5}{15} + \frac{4 \cdot 3}{15}}{2}$

Step 2.4

Combine the numerators over the common denominator.

$\frac{\frac{2 \cdot 5 + 4 \cdot 3}{15}}{2}$

Step 2.5

Simplify the numerator.

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Step 2.5.1

Multiply $2$ by $5$ .

$\frac{\frac{10 + 4 \cdot 3}{15}}{2}$

Step 2.5.2

Multiply $4$ by $3$ .

$\frac{\frac{10 + 12}{15}}{2}$

Step 2.5.3

Add $10$ and $12$ .

$\frac{\frac{22}{15}}{2}$

Step 3

Multiply the numerator by the reciprocal of the denominator.

$\frac{22}{15} \cdot \frac{1}{2}$

Step 4

Cancel the common factor of $2$ .

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Step 4.1

Factor $2$ out of $22$ .

$\frac{2 (11)}{15} \cdot \frac{1}{2}$

Step 4.2

Cancel the common factor.

$\frac{2 \cdot 11}{15} \cdot \frac{1}{2}$

Step 4.3

Rewrite the expression.

$\frac{11}{15}$

Step 5

Divide.

$0.7\overline{3}$

Step 6

The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.

$0.7$