Combinations to 100

Here is our 'Combinations to 100' Power Point. This will help you with your place value knowledge and your addition speed.

To play, just click the play button, then stop the slideshow at a random point. Your job is to say the number that needs to be added in order to make 100 (we could also call this the 'complement').  For example, if 50 comes up, you'd answer "50."  If 31 comes up, you'd answer "69."

So, how good are you at your combinations to 100?