Unit 4:  The Multiplication Algorithm

Activity 4: Multiplication using Expanded Notation (GLEs: 11, 13, 17)

CC: 

Have students work with a partner. Both students decide on a good estimate for the problem. Then one person restates one of the two-digit factors in expanded notation form to multiply.  The other person uses the calculator to check the answer. For example:  65 X 23 = Estimate ( 70 X 20 = 1400).  Then one student uses expanded notation (distributive property) to solve the problem.

Example:

                                                 65                         65

          x 20                        x 3

          1300          +           195 = 1495 

Have students use the following worksheet to estimate and solve using expanded notation.

Word Templates -

"Expanded Notation"

"Multiplication using Expanded Notation"

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