Unit+2+-+Lesson+1+-+Using+the+Number+Line+Method+to+Model+Adding+Positive+and+Negative+Integers

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The ExploreLearning: Adding & Subtracting Gizmo lets users explore the addition and subtraction of integers using a number line. A slider controls the value of both the first and second integers. The arrows helps to guide the user in which direction the numbers travel across the number line, as each operation is performed (i.e. The number travels left across the number line while subtracting or while adding a negative number). Great visual tool.======