M7_0705_Percent_change.notebook
February 08, 2016
Topic: Percents
2/8/16
Aim: How can two amounts of change
be the same but the percent of change
can be different?
Assessment
Review books $7
due Wednesday!!
HW: Finish Handout 7-05
Try Now:
A baby monkey
at birth weighs
2 lbs.
A baby elephant
at birth weighs
200 lbs.
If they both gain 5 lbs, would you say this
change in weight is the same for both?
Feb 9­4:17 PM
Percent of Change - a ratio that compares the
change in quantity to the original amount.
The percent of change could be a
percent INCREASE or a percent DECREASE
(SUBTRACT original and new amount)
Example: If you wanted to see the movie Coraline in
1961 you would have paid $2.00. Today
you have to pay $12.00 in most NY theaters!
What is the percent of change?
Step 1: Amount of change.
Step 2: Percent of change.
Feb 9­4:17 PM
1
M7_0705_Percent_change.notebook
February 08, 2016
Aim: How can two amounts of change be the same but the
percent of change can be different?
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % %
Feb 9­4:17 PM
Aim: How can two amounts of change be the same but the
percent of change can be different?
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % %
Relative Error is Relative!!!!
Ms. Bisal worked at a clothing store once a week on Saturdays for 8 hours and made $8 an hour.
How much did she make a week? _______________
Beyonce makes about $53 million a year. How much does she make a week? ___________________________
Both Ms. B's paycheck and Beyonce's paycheck was short $50.00
For whom was the error more significant? Feb 9­4:17 PM
2
M7_0705_Percent_change.notebook
February 08, 2016
Aim: How can two amounts of change be the same but the
percent of change can be different?
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % %
Whoopsie Daisy!
15 lbs
I guessed the weight of a dalmatian and the weight of a dinosaur..
I guessed the dalmatian was 65 pounds and I guessed the dinosaur was 4050 pounds. How much was I off by? Dalmatian: ____________
Dinosaur:_____________
4000 lbs
Do you think my error was the same for both?
Feb 9­4:17 PM
Relative Error is Relative!!!!
15 lbs
Jack guessed the puppy was 65 pounds.
50 pounds too much!
Jill guessed the dinosaur was 4050 pounds.
50 pounds too much!
Do you think the error was the same?
4000 lbs
Percent of Error - a ratio that compares the inaccuracy of an
estimate to the actual amount.
subtract actual amount and guessed amount
example:
difference/error
actual
=
% error
100
Kevin estimates the mass of an object to be 120 grams.
The actual mass is 138 grams. What is the percent of error?
Step 1: Amount of error.
Step 2: Percent of error.
Feb 9­4:17 PM
3
M7_0705_Percent_change.notebook
February 08, 2016
Aim: How can two amounts of change be the same but the
percent of change can be different?
% % % % % % % % % % % % % % % % % % % % % % % % % % % % % %
Feb 9­4:17 PM
Aim: How can two amounts of change be the same but the
percent of change can be different?
% % % % % % % % % % % % % % %% % % % % % % % % % % % % % %
Feb 9­4:17 PM
4
M7_0705_Percent_change.notebook
February 08, 2016
Aim: How can two amounts of change be the same but the
percent of change can be different?
% % % % % % % % % % % % % % %% % % % % % % % % % % % % % %
Feb 9­4:17 PM
5