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Types of Strategies to Solve
Percentage Problems
By: 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 = 2.5
                   10% 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 = 3.0
                   10% of 30 = 3.0
                   10% of 30 = 3.0

                  30% of 30 =
                            9.0
10% Rule –Example 3

30% of 30 = ?      10% of 30 = 3.0
                   10% of 30 = 3.0
                   10% of 30 = 3.0

                  30% of 30 =
                            9.0
Percent Proportion

Non
Percentage
               Part =    %    Percentage
                              Amount
Amount        Whole     100

               is      %
                    = 100
 Non                           Percentage
 Percentage
 Amount        of              Amount
Percent Proportion – Example 1

Non
Percentage
               Part =    %    Percentage
                              Amount
Amount        Whole     100

               is      %
                    = 100
 Non                           Percentage
 Percentage
 Amount        of              Amount
Percent Proportion – Example 2

Non
Percentage
               Part =    %    Percentage
                              Amount
Amount        Whole     100

               is      %
                    = 100
 Non                           Percentage
 Percentage
 Amount        of              Amount
Percent Proportion – Example 3

Non
Percentage
               Part =    %    Percentage
                              Amount
Amount        Whole     100

               is      %
                    = 100
 Non                           Percentage
 Percentage
 Amount        of              Amount
Percent Equation

     %  Whole = Part
Percent Equation – Example 1

     %  Whole = Part
Percent Equation – Example 2

     %  Whole = Part
Percent Equation – Example 3

     %  Whole = Part
Percent of Change Equation –
   Example 1

New – Old = Percent of Change
  Old
Tic-Tac-Toe


Whole/Original           Start
Amount             100
Change (+ or -)
                     %   + or -

Part of Original
Amount               %   End
Tic-Tac-Toe – Example 1


Whole/Original                Start
Amount               100
Change (+ or -)
                        %     + or -

Part of Original
Amount                  %     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

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Module3

  • 1. Types of Strategies to Solve Percentage Problems By: Kari Knisely
  • 2. 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
  • 3. What you will need… Take notes as needed in order to familiarize yourself with the strategies presented. Pencil Paper
  • 4. 10% Rule  Great way to estimate any percentage problem
  • 5. 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
  • 6. 10% Rule – Example 1 40% of 25 = ? 10% of 25 = 2.5 10% of 25 = 2.5 10% of 25 = 2.5 10% of 25 = 2.5 40% of 25 = 10.0
  • 7. 10% Rule –Example 2 30% of 30 = ? 10% of 30 = 3.0 10% of 30 = 3.0 10% of 30 = 3.0 30% of 30 = 9.0
  • 8. 10% Rule –Example 3 30% of 30 = ? 10% of 30 = 3.0 10% of 30 = 3.0 10% of 30 = 3.0 30% of 30 = 9.0
  • 9. Percent Proportion Non Percentage Part = % Percentage Amount Amount Whole 100 is % = 100 Non Percentage Percentage Amount of Amount
  • 10. Percent Proportion – Example 1 Non Percentage Part = % Percentage Amount Amount Whole 100 is % = 100 Non Percentage Percentage Amount of Amount
  • 11. Percent Proportion – Example 2 Non Percentage Part = % Percentage Amount Amount Whole 100 is % = 100 Non Percentage Percentage Amount of Amount
  • 12. Percent Proportion – Example 3 Non Percentage Part = % Percentage Amount Amount Whole 100 is % = 100 Non Percentage Percentage Amount of Amount
  • 13. Percent Equation %  Whole = Part
  • 14. Percent Equation – Example 1 %  Whole = Part
  • 15. Percent Equation – Example 2 %  Whole = Part
  • 16. Percent Equation – Example 3 %  Whole = Part
  • 17. Percent of Change Equation – Example 1 New – Old = Percent of Change Old
  • 18. Tic-Tac-Toe Whole/Original Start Amount 100 Change (+ or -) % + or - Part of Original Amount % End
  • 19. Tic-Tac-Toe – Example 1 Whole/Original Start Amount 100 Change (+ or -) % + or - Part of Original Amount % End
  • 20. 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
  • 21. Works Cited  All images retrieved from Google images