IN ALGEBRA COUNTY DIVIDING INTEGERS 5 DIVIDED BY 6 CAN BE WRITTEN:

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Presentation transcript:

IN ALGEBRA COUNTY DIVIDING INTEGERS

5 DIVIDED BY 6 CAN BE WRITTEN:

5 DIVIDED BY 6 That’s the best way.

could mean 12 m&m’s divided among six people. Each person has a dixie cup. What does division mean?

could mean 6 m&m’s divided among four people. Each person has a dixie cup.

DIVISION RULES FOR NEGATIVE NUMBERS ARE THE SAME AS FOR MULTIPLICATION

Therefore: Positive positive = Positive negative = Negative positive = Negative negative =

The number 1 is very important in Algebra County: 1

Write these in your notes:

“Subtracting” Integers In Algebra County

In Algebra County, we don’t actually subtract. We think of the minus sign as a negative We can circle the number with its sign. We have 3 and negative 5

Negative 4 and negative Negative 1 and and negative

Remember how we put a “1” in places where it is understood to be? 3 - (- 5) 3 and negative 1 times negative 5 1

-4 - (- 5) Neg 4 and neg 1 times neg (- 3) Neg 1 and neg 1 times neg (- 2) 7 and neg 1 times neg

-4 - (- 5) Negative times negative is positive. 1 The answer is: We multiply before adding Write these in your notes:

Negative times negative is positive. 2 The answer is: -1 - (- 3)1 We multiply before adding

7 + 2 Negative times negative is positive. 9 The answer is: 7 - (- 2)1 We multiply before adding

Negative times negative is positive. -2 The answer is: -3 - (- 1)1 We multiply before adding

Now you have learned how to “subtract” Without subtracting

This is a symbol used in math. It shows that a number is definitely positive and is called the absolute value symbol.

We put numbers or variables inside the lines. = The answer is 3 because the absolute value of anything is positive.

= Even if we have a negative inside the absolute value sign:

Here’s an example:

= We add the numbers inside first. =

The End