Basic Math Examples

100

$100$ ,

95

$95$ ,

90

$90$ ,

85

$85$ ,

80

$80$

Step 1

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

\frac{100 + 95 + 90 + 85 + 80}{5}

$\frac{100 + 95 + 90 + 85 + 80}{5}$

Step 2

Cancel the common factor of

100 + 95 + 90 + 85 + 80

$100 + 95 + 90 + 85 + 80$ and

5

$5$ .

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Step 2.1

Factor

5

$5$ out of

100

$100$ .

\frac{5 \cdot 20 + 95 + 90 + 85 + 80}{5}

$\frac{5 \cdot 20 + 95 + 90 + 85 + 80}{5}$

Step 2.2

Factor

5

$5$ out of

95

$95$ .

\frac{5 \cdot 20 + 5 \cdot 19 + 90 + 85 + 80}{5}

$\frac{5 \cdot 20 + 5 \cdot 19 + 90 + 85 + 80}{5}$

Step 2.3

Factor

5

$5$ out of

5 \cdot 20 + 5 \cdot 19

$5 \cdot 20 + 5 \cdot 19$ .

\frac{5 \cdot (20 + 19) + 90 + 85 + 80}{5}

$\frac{5 \cdot (20 + 19) + 90 + 85 + 80}{5}$

Step 2.4

Factor

5

$5$ out of

90

$90$ .

\frac{5 \cdot (20 + 19) + 5 \cdot 18 + 85 + 80}{5}

$\frac{5 \cdot (20 + 19) + 5 \cdot 18 + 85 + 80}{5}$

Step 2.5

Factor

5

$5$ out of

5 \cdot (20 + 19) + 5 (18)

$5 \cdot (20 + 19) + 5 (18)$ .

\frac{5 \cdot (20 + 19 + 18) + 85 + 80}{5}

$\frac{5 \cdot (20 + 19 + 18) + 85 + 80}{5}$

Step 2.6

Factor

5

$5$ out of

85

$85$ .

\frac{5 \cdot (20 + 19 + 18) + 5 \cdot 17 + 80}{5}

$\frac{5 \cdot (20 + 19 + 18) + 5 \cdot 17 + 80}{5}$

Step 2.7

Factor

$5$ out of

$5 \cdot (20 + 19 + 18) + 5 (17)$ .

$\frac{5 \cdot (20 + 19 + 18 + 17) + 80}{5}$

Step 2.8

Factor

$5$ out of

$80$ .

$\frac{5 \cdot (20 + 19 + 18 + 17) + 5 \cdot 16}{5}$

Step 2.9

Factor

$5$ out of

$5 \cdot (20 + 19 + 18 + 17) + 5 (16)$ .

$\frac{5 \cdot (20 + 19 + 18 + 17 + 16)}{5}$

Step 2.10

Cancel the common factors.

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Step 2.10.1

Factor

$5$ out of

$5$ .

$\frac{5 \cdot (20 + 19 + 18 + 17 + 16)}{5 (1)}$

Step 2.10.2

Cancel the common factor.

$\frac{5 \cdot (20 + 19 + 18 + 17 + 16)}{5 \cdot 1}$

Step 2.10.3

Rewrite the expression.

$\frac{20 + 19 + 18 + 17 + 16}{1}$

Step 2.10.4

Divide

$20 + 19 + 18 + 17 + 16$ by

$1$ .

$20 + 19 + 18 + 17 + 16$

Step 3

Simplify by adding numbers.

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Step 3.1

Add

$20$ and

$19$ .

$39 + 18 + 17 + 16$

Step 3.2

Add

$39$ and

$18$ .

$57 + 17 + 16$

Step 3.3

Add

$57$ and

$17$ .

$74 + 16$

Step 3.4

Add

$74$ and

$16$ .

$90$