Number Line Addition and Subtraction 2.2 and 5.1 Remember to silence your cell phone and put it in your bag.

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Presentation transcript:

Number Line Addition and Subtraction 2.2 and 5.1 Remember to silence your cell phone and put it in your bag.

Whole Number Addition a + b = ? Start at 0, facing the positive direction. Move forward a. Move forward b.

Whole Number Subtraction a – b = ? Start at 0, facing the positive direction. Move forward a. Turn around. Move forward b.

Integer Addition a + b = ? Start at 0, facing the positive direction. If a>0, move forward a. If a<0, move backward |a|. If b>0, move forward b. If b<0, move backward |b|.

Integer Subtraction a – b = ? Start at 0, facing the positive direction. If a>0, move forward a. If a<0, move backward |a|. Turn around. If b>0, move forward b. If b<0, move backward |b|.

Modeling Integer Operations I do not have to model integer operations the same way Dr. Simons does, BUT I must get my model approved prior to Test 1.