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MULTIPLYING DECIMALS AND EXPLORING PATTERNS

To multiply money, we use decimal multiplication.  An example would be to multiply $3.25 times 6 to get $19.50.  We’ll take a look at other decimals and how to multiply them.

To place the decimal point when multiplying decimals, count the decimal places in each factor and total them.  The total is the number of decimal places that will be in the product.  We will examine more multiplication problems.

Number patterns are everywhere.  When counting by 5’s, we are stating a number pattern:  5, 10, 15, 20, 25, ...   We’ll look at more interesting patterns with numbers. Calculators can speed up the exploration of number patterns.  We’ll see how a calculator can be a tool to aid in exploring patterns.

Using variables we can express a description of a pattern mathematically.  We will explore using variables to describe patterns.

Note:  Remember that the answer to a multiplication problem is called the product.

More Decimal Multiplication

Multiplying Decimal Numbers

The Britannica login and password may be required for some of the activities. Login:  vla            Password:  student

Patterns Study the number of smiley faces that make up the pattern. How many smiley faces will make up the next step?  Draw a table to show the relationship between the step of the sequence and the number of smiley faces.

Patterns and Variables The 5th Grade Class is raising money for a field trip.  They are selling spaghetti dinner tickets for $4.50.  The table below shows the cost for up through 5 tickets. Megan sold 8 tickets.    Write a rule for the pattern in the ticket sales.  Use T for a variable that represents the number of tickets.  Use C to represent the cost of the tickets.   C = T × 4.50 Use the rule to find the amount of money Megan owes for the tickets.        C = T × $4.50        C = 8 × $4.50        C = $36.00

Below are additional educational resources and activities for this unit.

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Unit 16 Multiplying Decimals Worksheet

Unit 16 Complete the Number Series Worksheet