Day 12 ­ Percent Change.notebook
March 31, 2017
Entrance Task
Agenda
­Grab the Day 4.12 notes from the table.
­Begin working on the Entrance Task
1. Entrance task
2. Go over homework
3. Notes/Practice Problems
4. Begin Homework
Announcements:
The marking period ends in ONE WEEK! See me for a pass if you need to talk about your grade or make anything up!
Homework
Day 4.12
1
Day 12 ­ Percent Change.notebook
March 31, 2017
Entrance Task: a. What percent of the arrows is pointing down?
b. What percent of the arrows is filled­in? c. What percent of the arrows is pointing to the right? d. What percent of all of the arrows does each arrow represent? Example 1: Finding a Percent Increase If another arrow were added to the box above in the entrance task, what will be the percent increase in the number of arrows? 2
Day 12 ­ Percent Change.notebook
March 31, 2017
change
original
amount
amount of change
original amount
3
Day 12 ­ Percent Change.notebook
March 31, 2017
Suppose instead of increasing the collection by 5 cards, Jon increased his 15­card collection by just 1 card. Will the percent increase be the same as when we increased the number of arrows by 1 arrow (in Example 1)? Example 2: Ken said that he is going to reduce the number of calories that he eats during the day. Ken’s trainer asked him to start off small and reduce the number of calories by no more than 7%. Ken estimated and consumed 2,200 calories per day instead of his normal 2,500 calories per day until his next visit with the trainer. Did Ken reduce his calorie intake by no more than 7%? 4
Day 12 ­ Percent Change.notebook
March 31, 2017
Find the percent decrease from 25 to 20. Find the percent increase from 20 to 25. Gary was buying golf clubs originally marked at $200, but he got them on sale for $190. What was the percent change in the price? What was the discount rate? 5
Day 12 ­ Percent Change.notebook
March 31, 2017
During the war, there was a sharp decline in immigration as the numbers of newcomers passing through Ellis Island decreased from 178,416 in 1915, to just 28,867 in 1918.Post­war immigration quickly revived and 560,971 immigrants passed through Ellis Island in 1921. a. Find the percent decrease of the number of immigrants received between 1915 and 1918. b. Find the percent increase of the number of immigrants received between 1918 and 1921. 6
Day 12 ­ Percent Change.notebook
March 31, 2017
In 1890, 22 million people lived in urban areas. By 1900, 30 million people lived in urban areas. What was the percent increase? Two weeks ago, gas was $3.50 per gallon. The percent increase of the price of gas from then until now is 2 percent. How much is gas now? Seattle, Washington, receives an average of 6.0 inches of precipitation in December. In March, the average precipitation is 3.8 inches. What is the percent decrease from December to March? 7
Day 12 ­ Percent Change.notebook
March 31, 2017
­ Homework:
4.12
Day
8