Chapter 3 part1

PERFORMANCE OBJECTIVES Section I Understanding Decimal Numbers 3-1: Reading and writing decimal numbers in numerical and word form 3-2: Rounding decimal numbers to a specified place value Section II Decimal Numbers and the Fundamental Processes 3-3: Adding and subtracting decimals 3-4: Multiplying decimals 3-5: Dividing decimals Section III Conversion of Decimals to Fractions and Fractions to Decimals 3-6: Converting decimals to fractions 3-7: Converting fractions to decimals © 2009 Cengage Learning. All rights reserved. 3–

Understanding Decimal Numbers (Page 68) Decimal numbers, or decimals Amounts less than whole, or less than one. For example, .44 is a decimal number. Decimal point A dot written in a decimal number to indicate where the place values change from whole numbers to decimal numbers. Mixed decimals Decimals written in conjunction with whole numbers. For example, 2.44 is a mixed decimal. © 2009 Cengage Learning. All rights reserved. 3–

Reading and Writing Decimals Step 1: Read or write the decimal part as if it were a whole number Step 2: Name the place value of the last digit on the right Note: The word “and” is used to represent the decimal point. © 2009 Cengage Learning. All rights reserved. 3–

Writing Decimals Example (Page 69) Write the following decimal numbers in numerical form: .25 twenty-five hundredths .00034 thirty-four hundred thousandths 15.901 fifteen and nine hundred one thousandths © 2009 Cengage Learning. All rights reserved. 3–

Multiplication Shortcut (Page 75) Whenever you are multiplying a decimal by a power of 10, such as 10, 100, 1,000, 10,000, etc., count the number of zeros in the multiplier and move the decimal point in the multiplicand the same number of places to the right. If necessary, add zeros to the product to provide the required places. © 2009 Cengage Learning. All rights reserved. 3–

Division Shortcut (Page 77) Whenever you divide a decimal by a power of 10, such as 10, 100, 1,000, 10,000, etc., count the number of zeros in the divisor and move the decimal point in the dividend the same number of places to the left. It may be necessary to add zeros to provide the required places. © 2009 Cengage Learning. All rights reserved. 3–

Chapter Review Problem 2 Overtime costs the company $15.50 per hour. If total Juanita Del Cid overtime was 26 hours last month, what was the cost to the company for her overtime? © 2009 Cengage Learning. All rights reserved. 3–

Chapter 3 part1

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Chapter 3 part1