Addition and Subtraction of Integers on a Number Line We are learning to…use a number line to add and subtract integers. Monday, August 10, 2015.

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Addition and Subtraction of Integers on a Number Line We are learning to…use a number line to add and subtract integers. Monday, August 10, 2015

Directions for adding and subtracting integers on a number line… 1. Start on the…first number in the expression. 2. To know which way to face on the number line look at the…sign of the second number in the expression. If it is positive face right because the positives are to the right on the number line. If it is negative face left because the negatives are to the left on the number line. 3. To move just remember: If you are adding…move forward. If you are subtracting…move backward.

Expression Start On…Face…Move… Solution:Equivalent Expression: -4 The positives Forward 5 steps 1 -4 – (-5)

Expression -1 – (-6) Start On…Face…Move… Solution:Equivalent Expression: The negatives Backward 6 steps

Expression 3 + (-7) Start On…Face…Move… Solution:Equivalent Expression: 3 The negatives Forward 7 steps -4 3 – 7

Expression -2 – 7 Start On…Face…Move… Solution:Equivalent Expression: -2 The positives Backward 7 steps (-7)

Expression 5 – (-5) Start On…Face…Move… Solution:Equivalent Expression: 5 The negatives Backward 5 steps

Expression -8 – (-17) Start On…Face…Move… Solution:Equivalent Expression: -8 The negatives Backward 17 steps

Negative Numbers Decreasing Numbers Increasing Positive Numbers Adding a Negative Adding a Positive Subtracting a Negative Subtracting a Positive

Make Connections! Adding a negative is the same as:_____________________ Adding a positive is the same as:______________________ Subtracting a positive is the same as:__________________ Subtracting a negative is the same as:__________________ Adding a Negative Subtracting a Negative Subtracting a Positive Adding a Positive Practice using a number line to add and subtract some integers with your teammates…think about an equivalent expressions as you are working!