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Addition and Subtraction of Positive and Negative numbers is very simple once you grasp the knowledge of how to do it.

Simply remember when a + and a - are together you - the values and when the signs are the same you + the values.

-+ = -

+- = -

++ = +

-- = +

Examples:

[1] 10 + -9 = 10 (+-) 9 = 10 - 9 = 1

[2] 10 - +9 = 10 (-+) 9 = 10 - 9 = 1

[3] 10 + +9 = 10 (++) 9 = 10 + 9 = 19

[4] 10 - - 9 = 10 (--) 9 = 10 - 9 = 1

Note : The above is much too complex for younger student minds.

FIRST Rule : Gather together all the numbers with the same signs. Then add all the positive numbers together. Do the same for the negatives.

Finally, subtract the negative total from the positive total, to get the final combined total or answer.

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Anonymous

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Q: What are the rules for adding and subtracting negative and positive numbers?
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