Integer Addition using the Vertical Number Line
An explanation of how to use a vertical number line to demonstrate the addition of integers or signed numbers. Positive numbers are movement upward, and negative numbers are movement downward.
Integer Subtraction using the Vertical Number Line
An explanation of how to use a vertical number line to demonstrate the subtraction of integers or signed numbers. Subtracting is moving downward. However, there is difficulty when subtracting a negative number with this model. Teachers should know the pros and cons of methods before they try them with their students.
Integer Multiplication using the Vertical Number Line
An explanation of how to use a vertical number line to demonstrate the multiplication of integers or signed numbers using the repeated addition model. There is difficulty when multiplying one negative number by another negative number. A better way to demonstrate this is shown in the Multiplication of Integers Using Patterns video.
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