Multiply Multi-Digit Numbers

Topic 4 - Intro Lesson

​Use Models and Strategies to Multiply Decimals

​Standards

​Content standards: 

CCSS.MATH.CONTENT.5.NBT.A.4

Use place value understanding to round decimals to any place.

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CCSS.MATH.CONTENT.5.NBT.B.5

Fluently multiply multi-digit whole numbers using the standard algorithm.

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Math Practice Standards:

​MP7. Look for and make sense of structures

​- I can use what I know to solve new problems

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Objectives

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Student Learning Objective(s):

​Content objectives:

Students will be able to explain the standard procedure for estimating and finding the product involving decimals. 

Language objectives:

Students will be able to confirm their knowledge of the mathematical vocabulary used to demonstrate their understanding of multiplication and rounding decimals.

Poll

Tell Ms. Richards, how do you feel about math so far this year?

​KWL Chart - Solar Energy

Multiple Choice

Solar Energy can be used in many ways.

• True

• False

• I'm not sure

Open Ended

Name 5 ways that we can use the

Sun's energy today.

​Describe at least one way you could use solar energy.

Could it save you and your family money?​

Open Ended

Estimate how much your family pays for energy costs as lights, gasoline, heating, cooling (in dollars and cents).

​On the back of your KWL chart...

​Make up a problem using multiplication whole numbers and decimals. Use your estimation to help you.

​Ms. Richards Example:

​I estimate my family spends $550.50 on energy every month. How much will we pay all year?

Multiple Choice

One way to estimate a number is to ________ the number. 

• take away

• round

• add

• multiply

Multiple Choice

Using 50 for the number of weeks in a year is a(n) _________.

• long time

• underestimate

• easy number 

• overestimate

Multiple Choice

In the number 3.072, the digit 7 is in the ______ place and the digit 2 is in the ______ place.

• ones, hundreds

• hundreds, thousands

• hundredths, thousandths

• tenths, ten thousandths

​Review: Whole Number Multiplication

​Review - Rounding Decimals

​On your whiteboard, round each to the nearest tenth.

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​1. 842.121​

​2. 10, 386. 145

Fill in the Blanks

$96\times42=\ 4,032\ so\ 42\times96\ =$  

​Exit ticket

On the back of your KWL chart:

Using what you know about multi digit multiplication, solve your estimated word problem about how much energy your family uses. Watch Ms. Richards solve hers, then you solve yours.

Poll

How ready are you to begin multipying whole numbers and decimals?