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Published byMeredith Henderson Modified over 8 years ago

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Integer Rules

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Adding with the same sign Rules Rules Add like normal Add like normal Keep the sign Keep the sign Examples Examples -12 + -10 = -22 (all signs are negative) 12 + 10 = 22 (all signs are positive

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Adding with different signs Rules Rules Subtract the difference of the absolute value (av) Subtract the difference of the absolute value (av) Keep the sign of the highest absolute value (av) Keep the sign of the highest absolute value (av) Examples Examples -10 + 8 10 – 8 (subtract av) -2 (keep sign of highest av)

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Subtraction with different signs Rule Rule Add the opposite Example Example 12 - (-12) = 12 + 12 = 24 (add the opposite of -12) 12 – (12) 12 + (-12) = 0 (add the opposite of 12)

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Multiplication & division (even number of signs) Rule Rule If you multiply or divide integers that have an even number of negative signs – then positive If you multiply or divide integers that have an even number of negative signs – then positive Examples Examples -5 x -7 = 35 (even number of negative signs - 2) -2 x -3 x -2 x -1 = 12 (even number of negative signs – 4) -3 x 2 x -1 x 2 = 12 (even number of negative signs – 2) -20 / -5 = 4 (even number of signs – 2)

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Multiplication & division (odd number of signs) Rule Rule If you multiply or divide a integers that have an odd number of negative sings – then negative Examples Examples -3 x 5 = -15 (odd number of negative signs – 1) -3 x 4 x -2 x -1 = -24 (odd number of negative signs – 3) 12 / -3 = -4 (odd number of signs - 1)

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Additional practice Integers Jeopardy – go to the following link Integers Jeopardy – go to the following link http://www.math-play.com/Integers-Jeopardy/Integers- Jeopardy.html http://www.math-play.com/Integers-Jeopardy/Integers- Jeopardy.html

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