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Chapter 13.4
Adding and multiplying percents
What You'll Learn
Calculate sales tax by converting percentages to decimals and multiplying
Determine final prices by adding tax amounts to original costs
Apply sequential percentage increases to calculate compound growth
Compute compound interest by repeatedly applying percentage rates to updated principals
Recognize that percentages cannot simply be added together in multi-step calculations
What You'll Practice
1
Calculating sales tax on purchases and finding total cost after tax
2
Computing sequential percentage increases across multiple time periods
3
Solving compound interest problems over multiple years
4
Determining actual percentage change between initial and final values
Why This Matters
Understanding how to add and multiply percentages is essential for managing your finances, from calculating sales tax on purchases to understanding how your savings grow with compound interest. These skills help you make informed decisions about spending, saving, and comparing deals in everyday situations.
Before You Start — Make Sure You Can:
This Unit Includes
4 Video lessons
Practice exercises
Skills
Percentages
Sales Tax
Compound Interest
Decimal Conversion
Sequential Calculations
Word Problems
Financial Math
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