Basic Mathematics for College Students

1.2 Adding Whole Numbers 23

EXAMPLE (^9) Money Find the perimeter of the dollar bill shown below.
Strategy We will add two lengths and two widths of the dollar bill.
WHY A dollar bill is rectangular-shaped, and this is how the perimeter of a
rectangle is found.
Solution
We translate the words of the problem to numbers and symbols.

 156  156  65  65

Use vertical form to perform the addition:

The perimeter of the dollar bill is 442 mm.

To see whether this result is reasonable, we estimate the answer. Because
the rectangle is about 160 mm by 70 mm, its perimeter is approximately
160  160  70  70 , or 460 mm. An answer of 442 mm is reasonable.

1

2

5

2

6

156

65

 65

442

The perimeter

of the

dollar bill

the width

of the

dollar bill.

plus

the width

of the

dollar bill

plus

the length

of the

dollar bill

plus

the length

of the

dollar bill

is

equal

to

The perimeter

of the

dollar bill

Length = 156 mm

Width = 65 mm mm stands fomillimetersr

Self Check 9

BOARD GAMESA Monopoly game

board is a square with sides

19 inches long. Find the

perimeter of the board.

Now TryProblems 65 and 67

6 Use a calculator to add whole numbers (optional).

Calculators are useful for making lengthy calculations and checking results. They
should not, however, be used until you have a solid understanding of the basic
arithmetic facts. This textbook does notrequire you to have a calculator. Ask your
instructor if you are allowed to use a calculator in the course.
The Using Your Calculatorfeature explains the keystrokes for an inexpensive
scientific calculator. If you have any questions about your specific model, see your
user’s manual.

Using Your CALCULATOR The Addition Key: Vehicle Production

In 2007, the top five producers of motor vehicles in the world were General

Motors: 9,349,818; Toyota: 8,534,690; Volkswagen: 6,267,891; Ford: 6,247,506;

and Honda: 3,911,814 (Source: OICA, 2008). We can find the total number of

motor vehicles produced by these companies using the addition key on a

calculator.

9349818 8534690 6267891 6247506 3911814

On some calculator models, the key is pressed instead of the for

the result to be displayed.

The total number of vehicles produced in 2007 by the top five automakers

was 34,311,719.

Enter 

34311719