Doubles Facts & Combinations of Ten

This week in math we have been looking at patterns in both doubles facts and combinations of ten.  On the following sheet, students needed to shade the doubles facts in green, and circle any facts that doubles could help you solve in green.  Next, they needed to shade the combinations of 10 in blue, and circle any facts that combinations of 10 could help you solve in blue.  It was quite a bit to keep track of! 

Here are some examples:

If you know that 4 + 4 = 8,  then 4 + 5 (one more than 4) = 9 (one more than 8)

If you know that 3+7 = 10, then you know that 3 + 8 (one more than 7) = 11 (one more than 10)

We talk about the idea that the more of these "doubles" and "tens" facts you know, the more "Fact Power" you have, which makes solving other problems that much easier!  Much like phonics and reading, the more basic words you know, the easier it will be to decode other, more complex words.