1. 2.NBT.6 Add up to four two-digit numbers using strategies based on place value strategies and properties of operations.

2. Mental Math Warm-Up Add 34 + 51 Be prepared to share your strategy for how you solved it.

3. Math Strategies 36 + 22+ 12 Which two numbers would you add first?

4. Math Strategies 56 + 12 + 9 Which two numbers would you add first ?

5. 4 two-digit addition 45 + 32 + 23 + 15 Which two numbers would you add first?

6. 4 two-digit addition Add 37 23 18 14

7. MP 3 Critique the Reasoning of Others My cousin Linda solved an addition problem. Does Linda have the correct answer? 57 + 42 + 24 + 11 = 135