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Hey kids today we are in outer space to save some numbers. To save the numbers we will need to answer some addition problems and use what we call the associative property. Will you help me Great lets get going. Here is an addition problem and the answer is trapped. The only way to save the number is to answer the question in a different way than we normally do. Here we have 4 + 3 + 7 equals. the trapped number that we do not know yet. There are a couple of ways we could solve this problem. We could add them in this order by counting on, using blocks or even using a ten frame. But to free the number we have to do something different. We are going to use our knowledge of doubles and partners of 10 to free the answer. In this problem we could add the 4 and the 3 together and that makes 7. Now we have a 7 to add to a 7 and that is a double. If you have learned doubles you know that 7 + 7 is 14 Wow, because I added those first two numbers together it gave me a double which is easier to add