Basic Math Examples

 $\begin{array}{r} h = & 9 \\ l = & 5 \\ w = & 4 \end{array}$

Step 1

The surface area of a box is equal to the sum of the areas of each side of the box.

$2 \cdot (l e n g t h) \cdot (w i d t h) + 2 \cdot (l e n g t h) \cdot (h e i g h t) + 2 \cdot (w i d t h) \cdot (h e i g h t)$

Step 2

Substitute the values of the length $l = 5$ , the width $w = 4$ , and the height $h = 9$ into the formula.

$2 \cdot 5 \cdot 4 + 2 \cdot 5 \cdot 9 + 2 \cdot 4 \cdot 9$

Step 3

Simplify each term.

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Step 3.1

Multiply $2 \cdot 5 \cdot 4$ .

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Step 3.1.1

Multiply $2$ by $5$ .

$10 \cdot 4 + 2 \cdot 5 \cdot 9 + 2 \cdot 4 \cdot 9$

Step 3.1.2

Multiply $10$ by $4$ .

$40 + 2 \cdot 5 \cdot 9 + 2 \cdot 4 \cdot 9$

Step 3.2

Multiply $2 \cdot 5 \cdot 9$ .

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Step 3.2.1

Multiply $2$ by $5$ .

$40 + 10 \cdot 9 + 2 \cdot 4 \cdot 9$

Step 3.2.2

Multiply $10$ by $9$ .

$40 + 90 + 2 \cdot 4 \cdot 9$

Step 3.3

Multiply $2 \cdot 4 \cdot 9$ .

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Step 3.3.1

Multiply $2$ by $4$ .

$40 + 90 + 8 \cdot 9$

Step 3.3.2

Multiply $8$ by $9$ .

$40 + 90 + 72$

Step 4

Simplify by adding numbers.

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Step 4.1

Add $40$ and $90$ .

$130 + 72$

Step 4.2

Add $130$ and $72$ .

$202$

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