Cargo Captain (Multi-digit Subtraction)

You are the captain of an interplanetary cargo ship, delivering important supplies to the outer planets. The cargo can be stored in barrels, crates, and holds. (There are 10 barrels in a crate, and 10 crates in a hold.) Model multi-digit subtraction by unloading cargo on each planet.

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HTML5

LEARNING OBJECTIVES:

  • Rewrite numbers by regrouping tens into ones.
  • Rewrite numbers by regrouping hundreds into tens.
  • Develop strategies for two- and three-digit subtraction.
  • Explain what is happening when you "borrow" during column subtraction.
VOCABULARY:
  • base-10 system, difference, regrouping, subtraction

LESSON MATERIALS:

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