Objective: Students will be able to multiply decimal numbers.

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Presentation transcript:

Objective: Students will be able to multiply decimal numbers. December 21, 2009 Math 201 Objective: Students will be able to multiply decimal numbers. Aim: How do we know where to put the decimal point when we multiply decimal numbers? Prior Knowledge: Multiply 23 x 4 = 56 x 44 = 372 x 65 =

Mini-lesson: Example: 45 x .3 = Step 1: Write the problem vertically (up and down) Step 2: Multiply as if the numbers are whole numbers Step 3: Count the total number of decimal place values in the problem, then count them off from right to left.

Guided Practice: Example 2 35 x .46 = Step 1: Write the problem vertically (up and down) Step 2: Multiply as if the numbers are whole numbers Step 3: Count the total number of decimal place values in the problem, then count them off from right to left.

Example 3: 4.56 x .7 = Step 1: Write the problem vertically (up and down) Step 2: Multiply as if the numbers are whole numbers Step 3: Count the total number of decimal place values in the problem, then count them off from right to left.

On the handout, do the first 3 problems while I stop by your desk to answer any questions you may have. Homework: