Represent and solve word problems involving addition and subtraction

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Presentation transcript:

Represent and solve word problems involving addition and subtraction 2.OA.1 Represent and solve word problems involving addition and subtraction

Choose an expression to solve and explain your strategy 13 + 7 25 + 16 56 + 38 Warm Up for solving addition problems mentally Choose an expression to solve and explain your strategy

Choose an expression to solve and explain your strategy 13 - 7 25 - 16 56 - 38 Warm Up for solving subtraction problems mentally Choose an expression to solve and explain your strategy

What operation will you use to solve this word problem? Now Solve I have 14 toy cars and I let my friend borrow some. Now I have 5 toy cars. How many cars did I let my friend borrow? Take From/Change Unknown 14 – X = 5 What operation will you use to solve this word problem? Now Solve

Is there more than one way to write the number sentence? Write the number sentence for the word problem below. Jesse is fishing. She caught 14 fish and put them in a net. Some swam away. Now she has 6 fish left. How many swam away? Add to or take from? Change Unknown 14 - ? = 6 or 6 + ? = 14 Is there more than one way to write the number sentence?

Which word problem is described by the number sentence below? I have some apples and someone gave me 15 more. I now have 23 apples. I have 15 apples and then someone gave me more. I now have 23 apples. The first is an add to/ start unknown The second is a add to/ change unknown 15 + ? = 23

I have 9 baseball cards. I want to display them in two different folders. What are all the ways I can display the baseball cards? Put togther- Take Apart – Both addends unknown 0 and 9 1 and 8 2 and 7 3 and 6 4 and 5 5 and 4 6 and 3 7 and 2 8 and 1 9 and 0