Percentage.

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Presentation transcript:

Percentage

Arrangement Before the Christmas Holiday This week: Percentage Next Week: Basic knowledge of 2D and 3D shape and revision The week before Christmas: Revision (Monday) and Two Tests: All the topics you have learned (Fraction and Decimal, Problem solving, Investigating Pattern, Algebra, Equation, Percentage and Basic knowledge of 2D and 3D shape)…. Summative Assessment: The topic of Summative Assessment is: Investigating Pattern and Algebra (Simple substitution)—Criteria A and C Materials for revision: 1, Textbook and Math Journal 2, 5-level growing pattern worksheet 3, One of the test paper 4, Mathletics

Definition of Percentage A number out of 100

Questions: 9 out of 100=?% 3.4 out of 100=?% 120 out of 100=?%

Questions 25/100 =?% 21/100=?% 42/100=?% 4.6/100=?%

Converting Fraction to Percentage 25/100 =25% 21/100=21% 42/100=42% 4.6/100=4.6% 1/4= ? % 1X25 4X25 =25/100=25%

Converting Fraction to Percentage A, 1/20=?% B, 4/5=?%

A number out of 100 1X5 20X5 =5/100 =5%

Percentage to Fraction 25/100 =25% 21/100=21% 42/100=42% 4.6/100=4.6% 25%=? 21%=? 42%=? 4.6%=?

A number out of 100 25%=25/100=1/4 21%=21/100 4.6%=4.6/100=46 /1000=23/500 Simplify /simplest form! %---divided by 100

Questions: Watch a clip and answer: 1, What is another way of changing fraction to percentage? 2, How to change decimal to percentage? 3, There is a mistake in the clip! Can you find out?

Decimal to Percentage http://www.youtube.com/watch?v=Kr52yfR3wGA

Moving the decimal point two places forward! How can we choose the different strategies in changing fraction to percentage? Fraction---- Decimal-----Percentage How to change decimal to percentage? X100% 0.23X100%=23 Moving the decimal point two places forward!

Which strategy to Choose? 3/4 5/9 5/8 2/7 …….

Practice 0.73=?% 0.073=?% 7.3=?%

Change Percentage to Decimal 0.73=?% 0.073=?% 0.0073=?% 7.3=?% 73%=? 7.3%=? 0.73%=? 730%=?

Homework My Pals are here 6A (the Blue textbook) Page 214 Question 1-7 and choose 2 from Question 8-12 to do (No calculator! It can only be used it to check your answers!)