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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 when you know your doubles. That was much faster than counting all the numbers one by one. This is what we call the associative property. We are using what we know about numbers to make adding faster. Wait a minute we just freed the 14 but now its trapped again. It looks like we still need to look at another way of adding using the associative property. What is another way we can add this problem faster? Here is a hint, look at the 3 and the 7. If we add the 3 and 7 together we get 10. Many of us have memorized partners of ten. Two numbers that add up to ten like 5 and 5 or 6 and 4 are partners of ten. So in this problem 3 and 7 is 10 and 10 plus anything is super easy. We know that 10 plus 4 is 14. We solved the problem another way and did it way faster. We now know how to add problems like these much faster by looking for partners of 10 and doubles. Thank you so much for helping me free the answer, keep practicing and we will see next time, goodbye. Thank you for watching. Please share the video and Subscribe.