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Addition and Subtraction of Integers on a Number Line

Addition and Subtraction of Integers on a Number Line . We are learning to… use a number line to add and subtract integers. Thursday, March 13, 2014. Warm Up. 1. 12. -14. -9. -5. Directions for adding and subtracting integers on a number line….

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Addition and Subtraction of Integers on a Number Line

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  1. Addition and Subtraction of Integers on a Number Line We are learning to…usea number line to add and subtract integers. Thursday, March 13, 2014

  2. Warm Up 1 12 -14 -9 -5

  3. Directions for adding and subtracting integers on a number line… • Start on the…first number in the expression. • 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. • To move just remember: • If you are adding move forward. • If you are subtracting move backward.

  4. Find the solutions to the following problems by using the number line in the front of the room. -4 -1 3 -2 5 8 -3 -8 The positives The negatives The negatives The positives The negatives The negatives The positives The negatives Forward 5 steps Backward 6 steps Forward 7 steps Backward 4 steps Backward 5 steps Forward 8 steps Backward 6 steps Backward 17 steps 1 5 -4 -6 10 0 -9 9 -4 – (-5) -1 + 6 3 - 7 -2 + (-4) 5 + 5 8 - 8 -3 + (-6) -8 + 17

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

  6. 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:__________________ Subtracting a Positive Subtracting a Negative Adding a Negative 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!

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