Operations with Integers

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Presentation transcript:

Operations with Integers Adding, Subtracting, Multiplying and Dividing Positive and Negative Numbers

What are you being asked to do? Add numbers Subtract numbers Multiply numbers Divide numbers

Do you numbers have the same sign or different signs? Adding Integers Do you numbers have the same sign or different signs? Same Signs Different Signs

Same Signs Keep the sign Add the numbers Ex: –4 + (–8) = –12

Different Signs Keep the sign of the number with the bigger absolute value Subtract like normal Ex: 7 + (–15) = –8

Subtracting Integers Change the subtraction to addition Change the second number to its opposite Now click here to follow the addition rules Ex: 4 – 9 Ex: 3 – (–4) 4 + (–9) 3 + (+4)

Multiplying Integers Same signs = positive answer Different signs = negative answer Also, if all your are doing is multiplying and there is an even number of negative signs, your answer will be positive. If there is an odd number of negative signs your answer will be negative.

Dividing Integers Same signs = positive answer Different signs = negative answer