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CH 3] Calculating Business 3-1

CHAPTER 3 NOTE TO INSTRUCTOR: Solutions
to Homework are in that section.

Avg. time for Students to read &
complete homework: 4.5 hrs.

Everything Decimals

Sign at McDonalds reads “Large Sweet Tea $100”. Do you think

a decimal point is important?

3
Objectives

After mastering the material in this chapter, you will be able to:

• Convert fractions to their decimal value.
• Add, subtract, multiply, and divide decimal numbers.
• Compute quantity prices on an invoice.
• Perform constant operations in addition, subtraction, multiplication, and
division with a hand calculator.
• Calculate checking account balances in a check register.
• Reconcile a statement from a financial institution.
• Solve word problems that contain decimal numbers.

Chapter two gave you a good review of fractions and how to deal with them in your
calculations. In some instances fractions can be cumbersome and they become easier when
not dealing with the numbers as fractions but rather as decimals.
Decimal numbers are expressed as a whole number and its fractional parts and those
fractional parts delineate values that are less than one (Figure 3.12). These fractional parts
are to the right of the decimal point and can be expressed in hundreds (in money it is cents:
0.00), as thousands (0.000), as tens of thousands (0.0000), hundreds of thousands (0.00000)
and so forth as a number becomes more precise. These values are to the right of the decimal
point and are the fractional parts of the number.
Understanding how to convert a fraction to a decimal facilitates addition, subtraction,
multiplication and division of numbers. As you go through your daily living you see the world
expressed as decimal amounts. For example: the dollars you pay for food, clothing, rent,
utilities and your paycheck; the gallons of gas you purchase for your vehicle; the miles you
drive, and the hours of use on an engine.

Decimal Numbers: the numbers we use in everyday life are decimal numbers, because they are based on 10 digits
(0,1,2,3,4,5,6,7,8 and 9). "Decimal number" is often used to mean a number that uses a decimal point followed by
digits that show a value smaller than one. Example: 45.6 (forty-five point six) is a decimal number.

Fractional part: The fractional part or decimal part of a non‐negative real number is the excess beyond that
number's integer part.

Decimal point: a dot placed after the figure representing units in a decimal fraction.

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