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Add and Subtract Integers

In this topic we will cover addition and subtraction of integers using a number line and absolute values.

Topic: Add Integers

  • On the number line, positive integers indicate “to the right of zero” and negative integers indicate “to the left of zero”

  • To add two integers x and y, we can use 2 methods:

    a) Number line
    b) Absolute values

  • To add two integers with the same sign, find the sum of their absolute values and place the sign of the two integers

  • To add two integers with different signs, find the difference of their absolute values and place the sign of the integer with the greater absolute value

Topic: Subtract Integers

  • On the number line, positive integers indicate 'to the right of zero' and negative integers indicate 'to the left of zero'

  • To add two integers x and y, we can use 2 methods:

    a) Number line
    b) Absolute values

  • On a number line, integer subtraction is opposite of integer addition.
    To subtract an integer from another, change its sign and add it to the other

    (Now follow the steps to add integers)

  • To add two integers with the same sign, find the sum of their absolute values and place the sign of the two integers

  • To add two integers with different signs, find the difference of their absolute values and place the sign of the integer with the greater absolute value

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