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mathematics Review of expanded form and regrouping Created by: Tamara V. Russell

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Lesson Objective Today we will see if you remember how to use expanded form as a strategy for addition.

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Essential question How do you break apart addends to add thousands, hundreds, tens and then ones?

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vocabulary value – this is what a digit is worth based on its place within a number. expanded form – a way to write a number that shows the values of each digit of a number.

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review What is the value of the underlined digit? 33

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review What is the value of the underlined digit?

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review What is the value of the underlined digit?

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review What is the value of the underlined digit? 19,98510,000

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Expanded form Now lets review writing numbers in expanded form. Here is an example… 395 =

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review How do you write 281 in expanded form? 281 =

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review How do you write 3,561 in expanded form? 3,561 = 3,

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review How do you write 8,309 in expanded form? 8,309 = 8,

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review How do you write 45,897 in expanded form? 45,897 = 40, ,

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Lesson You can use expanded form as a strategy to add numbers. For example… 375 = = =

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Practice Can you complete the following problem? 412= = _____________________ _____ =

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Practice Can you complete the following problem? 223= = _____________________ _____ =

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Practice Can you complete the following problem? 560= = _____________________ _____ =

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practice Time for think, pair, share. First, complete lesson 7.1 on paper. Then work with a partner to share & check your work.

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regrouping Sometimes you will need to regroup in order to add. You can still use the expanded form strategy. For example… 235 = = = Take away a ten and then add ten to the tens column Ten plus 60 is? 70 10

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regrouping Lets try that again…. 235 = = = Take away a ten and add ten to the tens column Ten plus 70 is? The answer is….

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regrouping One more time… 425 = = = Take away a ten and add ten to the tens column Ten plus 110 is? The answer is…. Take away a hundred and add a hundred to the hundreds column

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White board practice Use your whiteboards and markers for the next three problems.

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practice Using the expanded form method, solve the following problem =

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practice Using the expanded form method, solve the following problem =

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practice Using the expanded form method, solve the following problem. 1, =

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Great Job! Exit ticket: How do you break apart addends to add thousands, hundreds, tens and then ones? Respond on your white board.

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