Addition and Subtraction of Integers

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Presentation transcript:

Addition and Subtraction of Integers Using a number line

Objectives be able to add integers using a number line be able to subtract integers using a number line

Adding a positive integer To use a number line to carry out +2 + +3 start at +2 face the positive direction move forward three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5 +2 + +3 = +5

Adding a negative integer To use a number line to carry out +2 + -3 start at +2 face the positive direction move backward three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5 +2 + -3 = -1

Subtracting a positive integer To use a number line to carry out +5 - +3 start at +5 face the negative direction move forward three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5 +5 - +3 = +2

Subtracting a negative integer To use a number line to carry out +2 - -3 start at +2 face the negative direction move backwards three spaces +1 +2 +3 +4 -4 -3 -2 -1 +5 -5 +2 - -3 = +5