Lesson 10-1: Adding Groups of 10 How is adding groups of 10 similar to adding numbers less than 10? If __ tens + __ tens = __ tens Then ___ + ___ = ___

Lesson 10-2: Adding Tens on a Hundred Chart How can you add tens on a hundred chart? I can add on a hundred chart by starting at ___ and moving DOWN ___ tens. Ex: …

Lesson 10-3: Adding Tens to Two-Digit Numbers How do you add tens to a two digit number? If I add __ + __, the ones digit stays the same. The tens digit changes: __ + __ = __

Lesson 10-4: Using Mental Math to Add tens How do you use mental math to add tens? I think of … Then I think of… This give me the sum of ___.

Lesson 10-5: Adding a Two-Digit Number How can you REGROUP to add ones? First, I show the addends: Then, I count the ones: Next, I regroup if needed: Finally, I show the sum: