Integers

Integers

Add, Subtract, Multiply and Divide

Review

Absolute Value 

• is the distance of |x| from zero

• it is always positive

• the symbol for absolute value are two vertical lines

Example

If I wanted the absolute value of -5 I would write it like this |-5. This means the absolute value of negative 5.

|-5| = 5

Multiple Choice

|-20|

• 20

• -20

Multiple Choice

What is the absolute value of |572|.

• 275

• -572

• 57

• 572

Multiple Choice

The absolute value of -3 is the distance between:

• 3 and -3 on the number line

• -3 and 0 on the number line

• 1 and 3 on the number line

• 1 and -3 on the number line

Adding Integers

• look at the signs to determine if they are the same or different

• Same sign add and keep the sign

• Different sign subtract and take the sign of the biggest number

Multiple Choice

-9 + 9

• 18
• -18
• 0
• 81

Multiple Choice

-10 + 4

• -14
• 14
• -6
• 6

Multiple Choice

A negative plus a negative will equal a ___________

• Positive

• Negative

• Zero

• Zero Pair

Multiple Choice

After I add the values, as in

6 + 7 or -6 + (-7)

How do I know which sign to use?

• always make it positive

• I look for the higher value

• I keep the sign the same

Multiple Choice

When I have the same sign, as in:

6+ 7 or -6 + (-7)

I must first ____________ the values.

• add

• subtract

• multiply

• divide

Subtracting

When you have a subtraction problem, rewrite it as an addition problem and change the sign of the number after the sign.

Multiple Choice

Using KFC method, write this problem as an addition problem.

-22 - (-7)

• -22 + 7

• -22 + (-7)

• 22 + 7

• 22 + (-7)

Multiple Choice

How would you rewrite -10 - 5?

• 10 + (-5)
• -10 + 5
• -10 + (-5)
• 10 + 5 

Multiple Choice

14 - 19 =

• 14

• 19

• -5

• 5

Multiple Choice

28 - (-14) = 

• 18
• -14
• -42
• 42

Multiply/Divide Integers

The rules are the same for multiplying and dividing integers. If the signs are the same the answer is positive. If the signs are different, the answer is negative.

Tic Tac Toe Chart

You can always create a tic tac toe chart to help you remember the rules. Start by putting positive diagonal and then fill in with negatives. It works backwards, forwards and diagonal.

Multiple Choice

 $-7\ \left(10\right)=$  

• 70

• 700

• -70

• -700

Multiple Choice

 $-20\div5=$  

• -4

• 4

• -100

• 100

Multiple Choice

When multiplying or dividing a NEGATIVE and POSITIVE integer your result will be...

• Positive

• Negative

• Depends on which number has the greater value.

Multiple Choice

When multiplying or dividing a NEGATIVE and NEGATIVE integer, your result will be...

• Positive

• Negative

• Depends on which number has the greater value.

Poll

How do you feel about integers?