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**Strategies Using Doubles**

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**Addition and subtraction with the same partners is called doubles.**

Addition Doubles Subtraction Doubles

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Odd and Even Doubles What do you know about even numbers?

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Odd and Even Doubles How can we decide if 6 is an even or odd number?

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Odd and Even Doubles How can we decide if 7 is an even or odd number?

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**The Doubles Plus 1 and Doubles Minus One Strategy!**

How might we use doubles to solve this problem? = ___

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7 + 6 = ___ Using a Double Plus 1 or Using a Double Minus 1

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7 + 8 = ___ Using a Double Plus 1 or Using a Double Minus 1

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6 + 5 = ___ Using a Double Plus 1 or Using a Double Minus 1

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8 + 9 = ___ Using a Double Plus 1 or Using a Double Minus 1

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**Let’s Practice Two-Step Story Problems**

Work in pairs. Retell the problem. What do you do first? What do you do second? Show your work. Use a variety of strategies.

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**Aretha has 7 whistles. She has 4 more whistles than Jeremy**

Aretha has 7 whistles. She has 4 more whistles than Jeremy. How many whistles do Aretha and Jeremy have altogether?

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**Mina buys 4 shirts and 5 skirts. She returns 2 skirts to the store**

Mina buys 4 shirts and 5 skirts. She returns 2 skirts to the store. How many new pieces of clothing does Mina keep?

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**Ed bought 9 bananas at one fruit stand and 3 at another**

Ed bought 9 bananas at one fruit stand and 3 at another. He bought 8 more bananas than Gail. How many did Gail buy?

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Felix had 7 pounds of white potatoes and 8 pounds of red potatoes to cook for the celebration. First he cooked 6 pounds. How many pounds of potatoes does he still have to cook?

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**Extra Practice Solve the problems in the first section by yourself.**

Then, use the letters for each answer to help you solve the riddle. If you finish, use the letters on the page to create your own riddle. Make sure you number the lines for the answer to your riddle correctly. Give your riddle to a classmate to solve.

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MATH UNIT 1 LESSON 20 Solve two-step word problems involving multiplication & division and assess the reasonableness of answers Or Solve word problems.

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