To add and subtract numbers with and without the number line.



Properties of Addition

n 2

Addition/Subtraction Rules

  1. If there are more than two numbers, add all of the positives together to get one positive term and add all of the negatives together to get one negative term then ...
  2. When there are only two numbers ...
    • If the signs are the same, add and keep the sign.
    • If the signs are different, subtract and keep the sign of the larger number.

Use this as a guide when two signs are next to each other (touching):   n 1


ex 1

ex 2

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This page was last updated on 08/09/13.