Welcome 2 nd Grade!

1. Welcome 2nd Grade! Associative Property Day 2 Click the link to play some fun math games!

2. Elluminate Rules During the presentation please listen carefully. Try your best. Be respectful of your classmates. If you have a question, please raise your hand or type it in the chat box.

3. Today we will... 2.8.2.A: Use the concept of equality and concrete objects to demonstrate understanding of the commutative and associative properties. Essential Question: How do I identify the Associative Property, and how does this property help me with my math?

4. Math Giggles.... 

5. Can you match the key words with their properties? Word Bank The Commutative Property states that you can add numbers in any ______________ to get the same sum. You can also multiply numbers in any _________________ to get the same product. The Associative Property states that you can ________________ numbers in different ways when adding and get the same sum. You can also _______________ numbers in different ways when multiplying and get the same product.

6. Associative Property of Addition When adding 3 numbers, we can group two numbers together to make it easier to add. Remember to do what is inside of the parentheses first! (5 + 4) + 6 = 15 and 5 + (4 + 6) = 15 We can also show this as one number sentence... (5 + 4) + 6 = 5 + (4 + 6)

7. Let’s practice! Remember to start with the numbers inside of the parentheses first! + 7 (12 + 8) + 7 = ?

8. Let’s practice! 6 + 6 + (6 + 4) = ?

9. Let’s practice! 8 + 8 + (10 + 2) = ?

10. Associative Property of Multiplication... Just like with addition, we can group numbers to make it easier to multiply! (5 x 2) x 4 = 40 and 5 x (2 x 4) = 40 We can also show this as one number sentence... (5 x 2) x 4 = 5 x (2 x 4)

11. Let’s review some multiplication strategies... How can I find the answer to 4 x 2? Draw an array Think of your cookies Use a multiplication chart-- let’s take a closer look at this...

12. How to use a multiplication table... Look for the first number across the top. What is 2 x 4? Follow the numbers until they meet to find your answer! Look for the second number on the left.

13. Let’s practice! x 6 (3 x 2) x 6 = ?

14. Let’s practice! x 4 (1 x 5) x 4 = ?

15. Let’s practice! 8 x 8 x (5 x 2) = ?

16. Let’s practice the Associative Property! Now we are going to try some multiple choice questions about the associative property. You will use your polling tools to choose A, B, C, or D as your answer.

17. Find the missing number... 3 + (4 + 5) = (3 + ___) + 5 5 4 3 9

18. Find the missing number... (5 x 2) x 3 = ___ x (2 x 3) 7 30 5 2

19. Find the missing number... (5 x 10) x 2 = 5 x (10 x ___) 10 50 5 2

20. Try this one! If 5 + (7 + 3) = 15, What is (5 + 7) + 3? 12 5 15 20

21. Try this one! If (2 x 4) x 1 = 8, What is 2 x (4 x 1)? 4 8 9 16

22. Excellent work!! Now it’s time for you to try some on your own. I will push out the Compass website to you so that you can complete your post test or extension activity..

23. How to take the pre-test... Log in to Compass with your username and password. Click on Math Assignments. Choose the folder: M2.A.2.8.2_Associative_Post or Extension Complete the post test. When you finish, make sure that you click and then “turn-in” to turn in your test.