(Numbers and Operations > Operations with Rationals > Addition and Subtraction > Integers)

Button screenshot

Once students have mastered the use of a number line to add integers, it’s time to begin working towards meaningful algorithms. I really like how Adding Integers With and Without a Number Line progresses naturally from students’ experience with a number line to generalizing what is happening when they add integers.

Example with a number line screenshot

The progression from concrete to visualizing happens amongst a nice mix of true/false, input, ordering, and association style questions.

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