Operations with integers

By: Maria and Rodrigo

Rules

- + = -

+ - = -

+ + = +

- - = +

Adding integers

  1. add the numbers and keep the sign. (+2) + (+3) = (+5) (-2) + (-3) = (-5)
  2. subtract the numbers and keep the signs of the nmber with the greatest absolute value. (+2) + (-3) = (-1) (-2) + (+3) = (+1)

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subtracting integers

  1. change the sign of the integer that needs to be subtracted.
  2. If both signs are positive the answer will be positive.
  3. if both signs are negative the answer will be negative.

multipling integers

  1. to multiply integers, always multiply the absolute value and use these rules to determine the sign of the answer.
  2. the product of two positive integers or two negative integers is positive.
  3. the product of a positive integer and a negative integer is negative.

dividing integers

  1. when you divide integers whith the same sign the result is always positive.
  2. just divide the obsolute values and make the answer positive.
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