This document discusses calculating percent increase and decrease using shortcuts. It explains that to find percent increase, you take the new value minus the old value, divide by the old value, and multiply by 100. To find percent decrease, you take the old value minus the new value, divide by the old value, and multiply by 100. Examples are provided to demonstrate calculating percent change when values increase from 110 to 440. Students are instructed to practice calculation percent increases and decreases in a group work and homework section.
2. Note Slide
Percent Increase – A Shortcut
%)%100( OldNew
Remember how we used this to find the new value in section 1.11?
What would we do if we wanted to find the % increase?
3. Note Slide
Percent Decrease – A Shortcut
%)%100( OldNew
Remember how we used this to find the new value in section 1.11?
What would we do if we wanted to find the % decrease?
4. Note Slide - Finding the Percent
change
Old
OldNew
%
5. Video Slide
Watch a Video
http://www.youtube.com/watch?v=TpZ
XX-GsmB0
Find the percent increase when a
number changes from 110 to 440.
6. Group Work Section 1.5
Remember to use complete sentences!
Explore #1-4
