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Integers - addition/subtraction

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by

Dana Mohn

on 5 February 2013

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Transcript of Integers - addition/subtraction

Adding & Subtracting Integers The Addition Rule When signs are the same, add and keep the sign


(-2) + (-4) = -6

2 + 4 = 6 The Addition Rule BUT If the signs are not the same, find the difference and use the sign of the greatest integer.

(-2) +4 = 2

2 + (-4) = -2 The Subtraction Rule Subtraction is "addition of the opposite." Another way to think about it is, Keep - Change - Change.

Keep the first the same
Change the sign to addition
Change the last integer to it's opposite

-3 - 7 =
-3 + (-7) = -10
remember the addition rule - signs are the same, add and keep the sign. Remember Addition - when signs are the same --> add the numbers keep the sign.

Addition - when signs are NOT the same --> find the difference and keep the sign of the largest integer.

Subtraction - is addition of the opposite or Keep - Change - Change, then follow the rules for addition. Your Turn 3 + (+4) =
-1 + (-6) =
-7 + 5 =
8 + (-9) = Your Turn 8 - 3 =
-7 - (-9) =
8 - (-4) = The Subtraction Rule BUT BUT if the signs are now different you will need to find the difference and keep the sign of the greatest integer.

5 - 7 =
5 + (-7) = -2
-8 - (-5) =
-8 + 5 = -3 add, subtract, multiply, and divide with decimals; add with negative integers; subtract positive integers from negative integers; and verify the reasonableness of the results 5NS 2.1
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