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

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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**What is the value of the underlined digit?**

review What is the value of the underlined digit? 3 3

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**What is the value of the underlined digit?**

review What is the value of the underlined digit? 75 5

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**What is the value of the underlined digit?**

review What is the value of the underlined digit? 475 400

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**What is the value of the underlined digit?**

review What is the value of the underlined digit? 10,000 19,985

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Expanded form Now let’s 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 = 123 = 497 =

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**_____________________**

Practice Can you complete the following problem? 412 = 400 _____ + 10 _____ + 2 + = 200 + 80 _____ + 1 _____________________ 281 693 =

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**_____________________**

Practice Can you complete the following problem? 223 = 200 _____ + 20 _____ + 3 + = 100 + 50 _____ + 6 _____________________ 156 379 =

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**_____________________**

Practice Can you complete the following problem? 560 = 500 _____ + 60 _____ + 0 + = 400 + 10 _____ + 9 419 _____________________ 693 =

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**Time for think, pair, share.**

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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**Take away a ten and then add ten to the tens’ column**

regrouping Sometimes you will need to regroup in order to add. You can still use the expanded form strategy. For example… 10 235 = 135 = 370 = 70 Take away a ten and then add ten to the tens’ column Ten plus 60 is?

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**Take away a ten and add ten to the tens’ column**

regrouping Let’s try that again…. 10 235 = 146 = 381 = 80 1 Take away a ten and add ten to the tens’ column The answer is…. Ten plus 70 is?

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regrouping One more time… 100 10 425 = 198 = 623 = 600 20 3 Take away a hundred and add a hundred to the hundreds’ column. Take away a ten and add ten to the tens’ column The answer is…. Ten plus 110 is?

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**Use your whiteboards and markers for the next three problems.**

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

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**Using the expanded form method, solve the following problem.**

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

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**Using the expanded form method, solve the following problem.**

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

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**Using the expanded form method, solve the following problem.**

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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