Before we start learning how to subtract bigger numbers, you really need to get how place values work.  If you don't, subtracting is going to get really confusing!

Look at this number:

Remember how you can expand this out:

When we get set up to subtract big numbers, we're going to use stacking and stripes -- just like we did with addition.

Remember that this is how we stack and stripe:

When we load this number in for subtraction, we'll just put it in like this:

But, I want you to remember that this 2 is really 20!