Post on 03-Dec-2014
description
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
=Non Percentage Amount
Non Percentage Amount
Percentage Amount
Percentage Amount
Percent Proportion – Example 2
PartWhole
%100
=isof
%100
=Non Percentage Amount
Non Percentage Amount
Percentage Amount
Percentage Amount
Percent Proportion – Example 3
PartWhole
%100
=isof
%100
=Non Percentage Amount
Non Percentage Amount
Percentage Amount
Percentage 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 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