Operations on Decimal Numbers

Introduction

• Importance of planning and managing money during travel.
• Estimation and mental math are crucial for handling money and decimal calculations.
• Chapter focuses on improving skills with decimal operations.

Math Link

• At the end of the chapter, plan a week-long dream vacation.

What You Will Learn

• Perform and estimate results of decimal operations.
• Add, subtract, multiply, and divide decimal numbers.
• Use a calculator for operations with decimal numbers.

Key Words

• Estimate, overestimate, underestimate, order of operations.

Creating a Foldable

• Steps for organizing chapter learnings using a Foldable.

Add and Subtract Decimal Numbers

Focus

• Use estimation to check solution reasonableness.
• Front-end estimation for placing decimal points.
• Solve problems involving addition and subtraction of decimals.

Case Study: Estimating Distance

• Estimation of distances along the Yellowhead Highway using odometer readings.
• Differentiating overestimates and underestimates in calculations.

Examples

• Adding zeros after decimal points does not affect value.
• Use estimation methods: front-end estimation and relative size.

Practice Problems

• Place decimal points in sums and differences without calculating.

Multiply Decimal Numbers

Focus

• Estimation in placing decimal points in products.
• Multiply decimals with and without a calculator.

Examples

• Using front-end estimation and actual calculations to multiply decimal numbers.
• Practice with estimation and calculation using a calculator.

Divide Decimal Numbers

Focus

• Use estimation to place decimal points in quotients.
• Divide decimal numbers with and without a calculator.

Examples

• Estimating and calculating divisions using front-end estimation and number line methods.

Order of Operations with Decimal Numbers

Focus

• Use order of operations with decimal numbers.
• Solve problems using decimals to the thousandths place.

Examples

• Practice adding, subtracting, multiplying, and dividing in correct order.
• Use of brackets to alter order of operations.

Chapter Review and Exercises

• Various problems and exercises to test understanding of decimal operations.
• Includes real-life applications, estimation, and calculation problems.

Math Link Activity

• Plan a dream vacation, integrating aspects of decimal calculations learned in the chapter.

Conclusion

• Emphasizes practical applications of decimal operations in travel budgeting and everyday financial calculations.