Integers What? ? ? ?. Integers + + - - An integer is a whole number (not a fraction) that can be...

Integers

What????

Integers+

An integer is a whole number (not a fraction) that can be positive, negative, or zero. Therefore, the numbers 10, 0,

-25, and 5,148 are all integers.

IntegersKnow the signs

+ Positive (If it has NO sign, it is

POSITIVE.)

- Negative (AKA: opposite of)

Integers-

In order from least to greatest

-25, -5, -2, 0, 10, 51, 78

Integers+

Correct order from least to greatest?

5, -1, -5, 1, 11, -11, 0

-11, -5, -1, 0, 1, 5, 11

The correct order is…

Adding

Think MONEY!!

$$$$ $$$$

AddingSigns the same??Add and keep the

signs+2 + +3 = -2 + -3 =

Think MONEY!!

Sue has $2. Nancy gives her $3. Has much does Sue have now?

+2 + +3 = +5

Think MONEY!!

Sue owes $2. She needs to pay Miss Dixson $3. How much does Sue owe now?

-2 + -3 = -5

AddingSigns different??Actually subtract

Keep the sign of the “larger” number

AddingSigns different??

+2 + -3 = -1(3 - 2 =1 Use the

sign of the 3 because 3 is larger than 2)

AddingSigns different??

Sue wrote a check for $2. Billy gave Sue $3. How

much does Sue have now? -2 + +3 = +1

Adding

Think MONEY!!$$$$ $$$$

Remember When

SubtractingDo you already know how

add integers?

If you know how to add, you can also subtract.

Subtracting

SubtractingChange the sign of the

2nd integer and add

That’s it! Easy, huh?

+2 - -3 = +5

Subtracting

Change the sign of the 2nd integer and add

ALWAYS the 2nd integer

SubtractingChange the sign of the 2nd

integer and add (Now it is just like what we’ve done in the past.)

+2 - -3 =+5

MultiplyingIf the signs are the same, the

product will be positive.

+ x + = + - x - = ++2 x +3 = +6-2 x -3 = +6

MultiplyingIf the signs are different, the

product will be negative.

+ x - = - - x + = -

+2 x -3 = -6-2 x +3 = -6

DividingIf the signs are the same, the result will be positive.

+ ÷ + = + - ÷ - = ++6 ÷ +3 = +2-6 ÷ -2 = +3

DividingIf the signs are different, the result will be negative.

+ ÷ - = - - ÷ + = -

+6 ÷ -3 = -2-6 ÷ +3 = -2

IntegersAren’t they

fun????

Integers What? ? ? ?. Integers + + - - An integer is a whole number (not a fraction) that can be...

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