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How to solve one-step addition equation: 

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How to solve one-step addition equation: 

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How to solve one-step equations | Linear equations | Algebra I | Khan Academy

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Watch the videos over pictorial models, number line, and equations. Then take a look at the examples for each one.

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Pick two numbers you would like to add together that are higher than 50.

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Add a post to the "pictorial model" using your two numbers you picked. It should look like the example. If you are not able to use the drawing tool on your computer you may do it on paper and take a picture of it.

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Add a post to number line and create your own.

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Add a post to equation and create your own.