Rainbow Numbers

I just finished reading the parent replies to this week's TWAS (This Week At School) Journal entry and realized I should be explaining the term "Rainbow Numbers".

We are starting the year in Math being sure each and every student can quickly and easily say the number combinations that make 10-(7+3, 1+9, 4+6, etc).

The following video explains the thinking of these important numbers and shows where the name comes from.

Once they have mastered these facts, they can use them to help build numbers to any ten or even to 100 or 1000. 

This is a fun video that kids love singing along with. Be warned - it does say it might annoy parents!