Module3

Types of Strategies to Solve Percentage ProblemsBy: Kari Knisely

What you will learn…

When and how to use the following strategies:

10% Rule

Percent Proportion

Percent Equation

Percent of Change Equation

Tic-Tac-Toe Table

What you will need…

Take notes as needed in order to familiarize yourself with the strategies presented.

Pencil

Paper

10% Rule

Great way to estimate any percentage problem

10% Rule

Move the decimal 1 place to the left

10% of 40 = 4.0

10% of 32.6 = 3.26

10% of 2 = .2

10% of 5,345 =

534.5

10% Rule – Example 1

40% of 25 = ? 10% of 25 = 2.510% of 25 = 2.5

10% of 25 = 2.5

10% of 25 = 2.5

40% of 25

= 10.0

10% Rule –Example 2

30% of 30 = ? 10% of 30 = 3.010% of 30 = 3.010% of 30 = 3.030% of 30

= 9.0

10% Rule –Example 3

30% of 30 = ? 10% of 30 = 3.010% of 30 = 3.010% of 30 = 3.030% of 30

= 9.0

Percent Proportion

PartWhole

%100

=isof

%100

=Non Percentage Amount

Non Percentage Amount

Percentage Amount

Percentage Amount

Percent Proportion – Example 1

PartWhole

%100

=isof

%100



Percentage Amount

Percentage Amount


PartWhole

%100

=isof

%100



Percentage Amount

Percentage Amount

Percent Equation

% Whole = Part

Percent Equation – Example 1

% Whole = Part


% Whole = Part

Percent of Change Equation – Example 1

New – Old Old

= Percent of Change

Tic-Tac-Toe

Whole/Original Amount

Change (+ or -)

Part of Original Amount

100

%

%

Start

+ or -

End

Tic-Tac-Toe – Example 1

Whole/Original Amount

Change (+ or -)

Part of Original Amount

100

%

%

Start

+ or -

End

What you learned…

When and how to use the following strategies:

10% Rule

Percent Proportion

Percent Equation

Percent of Change Equation

Tic-Tac-Toe Table

Works Cited

All images retrieved from Google images

Module3

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