CHAPTER 3: ADDITION AND SUBTRACTION STRATEGIES

Lesson 6: Using Mental Math to Add

Goal

Add 2-digit numbers by adding tens and then adding or subtracting ones.

Builds Upon

Student Book pages 70–71

Instructions for Use

Addition Attack invites your child to solve 1- and 2-digit addition problems to stop aliens from landing.

Click “Go,” read the game instructions, then click “Go” again. Read the addition problem at the top of the screen, then, using your mouse, move the cannon below your answer. Click the mouse to shoot at the correct answer, then answer the next problem. Note that the cannon needs to be directly below the answer to hit it.