Unit 4 Contents

5. The leader places the first card in a discard pile then reads the next card. Players place this digit in another empty box. Play continues until all the boxes are filled.
6. When all the boxes are filled, players find their answers. Since the player with the largest (or smallest) correct answer wins the game, players should check their answers using a second strategy or estimate to see if their answers are reasonable.

Use the Self-Check Questions and menus on the Use Addition and Subtraction Strategies pages in the Student Activity Book to practice addition and subtraction of multidigit numbers.