Rules_for_Signed_Numbers - the left and positive numbers to...

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Rules For Signed Numbers: 1) When you are adding and the signs of the two numbers you are adding together are the same, add the absolute value of each number and assume the same sign. Example: (- 2) + ( - 4) = - 6 (+3) + ( + 6) = + 9 2) When adding two numbers where the signs are different, subtract the absolute value of the smaller number from the larger and assume the sign of the larger. Example: (- 6) + ( + 4) = - 2 3) When subtracting one number from another, change the sign of the " connector " and the sign of the number you are subtracting. Proceed with rule #1 or #2, whichever may then apply. Example: (- 5) – ( - 3) = ( - 5) + (+ 3) = - 2 DEFINITION: Absolute Value - The number of units away from 0. Absolute Value is depicted by a number or letter situated between two vertical lines |2| . It is not identified as being either negative or positive. Example: Picture in your mind a number line, 0 is in the center, with negative numbers to
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Unformatted text preview: the left and positive numbers to the right; neg -pos +----------------0----------------> A number that is (-2) is exactly the same distance from 0 as a number that is (+2); i.e., they are both exactly 2 units away from 0. The absolute value |-2| or |2| for both numbers is 2. Multiplication and Division of Signed Numbers + times + = + + divided by + = + + times - = -+ divided by - = -- times + = -- divided by + = -- times - = +- divided by - = + Grouping Symbols When parentheses occur within parentheses, we can make them different shapes, such as [ ] also called brackets and { } also called braces. They all have the same meaning. When more than one type of grouping symbol occurs, do the computations in the innermost first. Then work from the inside out. That's all there is to it!...
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