Rounding!

We have been practicing rounding in class.  This is finding the nearest ten or hundred.  One mistake often made is when you see a number like 487.  That number has 4 hundreds so some students may think that 487 rounds to 400, but the number is actually closer to 500. 
Here is a video to show how to use rounding hills to practice estimation.
http://youtu.be/yGD2rTQ6QxI

For a view of how rounding hills work, here are charts that explain how rounding works.

Please practice rounding at home!