Math 6A, Lesson 12, Spring 2019, 5/12/2019

zhenli Post in Teaching Plan
Comments Off on Math 6A, Lesson 12, Spring 2019, 5/12/2019

1. Reverse Percentage

  • In a box, 15% of the balls are green. If there are 54 green balls, find the number of balls in the box.
  • In the library, the fine for not returning a book on loan is 125% of the price of the book. If the fine for a book that was not returned was $90, find the price of the book.

2. Percentage increase

  • Increase = Increased_value ( End_value, or New_value) – Original_value
  • Percentage increase = ( IncreaseOriginal_value) x 100%
  • Increased_value = (100% + Increase %) x Original_value

3. Percentage decrease

  • Decrease = Original_value – Decreased_value ( End_value, or New_value)
  • Percentage decrease = (Decrease / Original_value) x 100%
  • Decreased_value = (100% – Decrease %) x Original_value

4. Home Work:

  • Handout:
    • Three pages
  • Workbook:
    • Page 40: 8, 9, 10, 11

 

« Prev: :Next »