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4.M.NBT.05

In this task, students will use various strategies to multiply 4-digit and 2-digit numbers by 2 digits. They will work collaboratively in a group to solve a given problem using at least 2 different methods and explain their reasoning for choosing these strategies. The focus is on reasoning abstractly, constructing viable arguments, modeling with mathematics, using appropriate tools strategically, and making use of structure. Students will have 7 minutes to complete the task and present their solutions to the group.

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4.M.NBT.05

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  1. 4.M.NBT.05 • IEEI Task

  2. 4.M.NBT.05 • I can use multiple strategies to multiply whole numbers of 4 digit and 2 digit by 2 digits.

  3. Mathematical Practices • #2: Reason abstractly and quantitatively. • #3: Construct viable arguments and critique the reasoning of others. • #4: Model with mathematics. • #5: Use appropriate tools strategically. • #7: Look for and make use of structure.

  4. Expectations • You will have 7 minutes to complete the following task with your table group. • Record your answer on the paper provided. • Each of you will have a job. Be respectful of each person’s thoughts and opinions. • Team Captain • Time Keeper • Materials Manager • Recorder

  5. Your Task • Your team will be given a question and asked to use at least 2 different ways to solve it. • Be sure to explain how you know these strategies worked and why you chose them.

  6. Your task • Solve the problem above using at least 2 different strategies. • Then create a list of reasons explaining how you know these strategies worked and why you chose them. 126 x 5

  7. Share out! • Materials Manager, please be prepared to share out. • Be prepared to share: • What your solution was. • What strategies your team used. • Why you chose those strategies and how you knew they worked.

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