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1st Grade: 1.0A Operations and Algebraic Thinking

Concept: Students will work with addition and subtraction equations

Goal: Students will determine the unknown number in a given equation using number bonds and illustrations. Through this number talk, students will share their responses and understand there are multiple ways to get to the solution they are seeking.

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Missing Addend: The number we are trying to solve for

Addition

Subtraction

Number bonds

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Please follow the signals during our number talk, everyone will have an opportunity to answer and share their answers. Be respectful when someone is talking.

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6 + ___ = 9

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1. Identify the missing addend, use color pencils or crayons to underline the missing number

2. Create your number bond

3. Fill in your number bond, alwasy remember that the number after the equal sign goes on the top of the number bond

4. Draw your circles to solve for the missing addend

5. Place your missing number inside your number bond.

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Students will initiate the number talk by sharing the spot of the missing addend. Then they will share the next step of the process which is drawing out the number bond. Students will interact with one another and place each number in its correct bond. Once the numbers are correctly placed, students will draw out 5 circles since that is a number given to them, students will then use their addition knowledge to add up to get to the number 8. Student can utilize a different crayon to add on to get to 8. Once they are finished they now know that the missing addend is 3 and that 5 + 3 =8.

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Students can get to the solution they need through number bonds and drawing out shapes, but they can also use a different strategy.

1st Strategy: Work backwards and use subtraction to solve

Ex: 5+ ___=8

Students can draw out 8 circles and take away 5 to solve for their missing addend

2nd Strategy: Use your number knowledge from the previous example. If 6 + 3=9, then 5+ 3=8

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What are we trying to solve for?

What strategy do we use to solve for our equation?

Do the placement of numbers in number bond matter?

Who knows what my next step is after I filled in my number bond?

Does anyone have a different way to solve for my missing addend?

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After our number talk is complete, students will receive a worksheet with three equations of missing addends. They will have 15 minutes to complete and turn it in. Teacher will stamp after completion.

4+____ = 8

7+ ___= 9

5+ ___ = 10