Saturday, November 12, 2011

Subtraction (Two Digit Value)

For this lesson, we'll be working with easy numbers just to get you used to how this stuff works.
We're going to work with everything stacked because this is what you'll always do with bigger numbers.
We're going to work backwards, just like we did with addition! 
I'm going to have you subtract the ones first... then the tens.  Like addition, you'll have to do it this way when the numbers get harder.
Let's jump in!
Stack them and line everything up:
Subtract down the stripes...  Do the ones first, then the tens:
subtracting the ones for 89-32subtracting the tens for 89-32
So, 89-32=57

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