**basics of percent of change,**where you are given the initial and final quantities, and you have to calculate the the percent of change (percent change, percentage change).

The main formula I use is to calculate the DIFFERENCE in the quantities divided by the original quantity. Then this fraction is written as a decimal, and as a percent.

In the second video, I solve two word problems that involve percentage change - one having to do with percentage increase in area, and another where the price of a washer is discounted by 10%, then by another 10%, and we are asked the total discount percentage--yet the PRICE of the washer is NOT given!

Teachers - feel free to use these problems in your teaching!

I have recently been making lots of videos, aiming to produce full playlists for certain topics such as percent, decimals, and fractions. I also have many older videos on various topics. Click the image on the left to see my Youtube channel and see what I have uploaded thus far.