**Materials:**

Stop watch

Pencil

**Procedure:**

Have your partner time how long it takes you to do all four problems in one column.

Time your partner doing the same four problems.

Complete the remaining columns in the same way.

Come to the front table and check each other’s papers after you’ve both finished all four columns.

**The Problems:**

Column 1: 13x5

462x5

87x5

78,956x5

Column 2: 13x12

462x12

87x12

78,956x12

Column 3:

13x100

462x100

87x100

78,956x100

Column 4: 13x10

462x10

87x10

78,956x10

For each column, record the time (in seconds) it took to complete the column and the number of problems you solved incorrectly.

**Discussion questions:**

Which number could you multiply by the fastest?

With which number did you make the fewest mistakes?

Explain what this activity had to do with the metric system.

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