Monday, September 10, 2007

Double Trouble!

In class we have been working on our doubles facts. We read a book called Double Trouble. (Amazon does not have it, but they do have a similar book called Two of Everything by Lily Toy Hong if you are interested in purchasing this book. http://www.amazon.com/Two-Everything-Lily-Toy-Hong/dp/0807581577 )

In the book we read in class, Mr. and Mrs. Rodriguez find a magic pot. Anything that falls into the magic pot doubles when it is taken out. The students have spent time writing excellent story problems about things that they wanted to put in the magic pot. (You can check out their stories displayed on the wall by our class bulletin board.) Tomorrow our entire class is going to be falling into the magic pot. Students will be using a variety of strategies to figure out how many students would be in our class if it fell into the pot.

To practice some of these concepts at home, have your child choose something to put in the magic pot. (More than 15 of something to get them working with numbers a little larger than the doubles facts they are working on memorizing.) Have your child show his or her work on paper to show how he or she found the answer.

Once your child has mastered doubles facts, move on to doubles subtraction facts. If you know the sums of 9+9, 8+8, 7+7, and 6+6, then you know the differences for: 18 – 9 = 9, 16 – 8 = 8, 14 – 7 = 7, 12 – 6 = 6.

Double it up! Great visualizations for doubles facts.
http://www.edutunes.com/free_materials_pages/we%20love%20math%20cd/double.htm

This game is a little more advanced, only because we haven’t talked about odd and even numbers yet. If you play, comment with your score!