Subtracting Across Zeros

Give this a try...Easiest thing I have come across!!!

using the standard algoritm for addition

Here we go, the standard algorithm...The method to addition that you all love!!!

Standard Algorithm for Addition...

Add using an open number line

Add Using An Open Number Line...
This is a REALLY cool way of doing addition which I think you will like! 

Add Using An Open Number Line

Partial Sums Addition Strategies...

Here is our video on partial sums using expanded form...

Partial Sums

Try these three problems in your notebook using partial sums...

64,321+12,256=

8,563+523=

21,032+23=

Remember to do these in your notebook!!!

Struggles with Powers of 10...

I posed the following question to students today and for some, it was particularly challenging...

"How is the 7 digit in 781,000 DIFFERENT from the 7 digit in 17?"

I got looks like I was crazy...About 3/5 of the class understood after some explanation.  the other 2/5 were still struggling.  I explained that as one moves through a place value chart each place increases 10 times.  So the 7 in 17 is 7x1 but when you move that 7 all the way to the 100,000 place, it is the same as 7x100,00.  I took this picture for you to see if it helps you to help explain this question. 
Thanks for helping me on this one...This is a high level Common Core State Standard we are addressing :)