This week we will continue our study of Integers. Last week we reviewed how to add and subtract integers so this week we will multiply and divide integers. We will end the week with Test 1-1 over all integers.
We need to remember for addition of integers you:
- Ask the question "Are my signs alike or different?"
If your signs are alike you add your numbers and keep the sign of the problem.
ex. 5 + 8 = 13 -13 + (-7) = -20
If your signs are different then you subtract your numbers and take the sign of the number with the greatest absolute value (farthest from 0).
ex. -8 + 6 = -2 -12 + 18 = 6
If you have a subtraction problem you:
Step 1: Keep the first number the same.
Step 2: Change you subtraction sign to an addition sign.
Step 3: Change you next number to its opposite.
ex. 12 - (-5) = -20 - (-8) =
12 + 5 = 17 -20 + 8 = -12
This week we will learn about multiply and divide integers. The good thing is the rules are the same.
Step 1: Multiply or divide the numbers like always.
Step 2: Count your negative signs.
- If there is an even number of negatives your answer is positive.
- If there is an odd number of negatives your answer is negative.
ex. 4 x (-6) = -24 -3 x (-2) x 3 = 18
24 / -8 = -3 -15 / -3 = 5
Bonus Question of the Week:
To earn 10 Bonus Points for the Week you need to copy the following problem on a sheet of paper. Work the problem showing your work. Provide me with your final answer with its correct label.
You owe $225. on your credit card. You make a $55. payment and then purchase $87 worth of clothes at Dillards. What is the integer that represents the balance owed on the credit card?
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