Multiplying Integers Day1

Multiplying Integers !

Labelling

Label the description

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The opposite of 3 groups of -5

The opposite of three groups of 5

Three groups of -5

Labelling

Where does -5 + -5 + -5 belong?

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-5 + -5 + -5

three groups of -5

There is 1 trick that we can use to multiply AND divide integers.

Count your negative integers!

• If you have an even number your answer is POSITIVE

• If you have an odd number your answer is NEGATIVE

Lets try some on the next slide...

Match

Match them correctly

• Odd negative numbers will give me a

• Even negative numbers will give me a

• negative x negative =

Negative Answer

Positive Answer

positive

• Negative Answer

• Positive Answer

• positive

Multiple Choice

If I have 1 negative integer the answer will be a..........

• Negative Number

• Positive Number

Multiple Choice

If I have 2 negative integers the answer will be a..........

• Negative Number

• Positive Number

Multiple Choice

If I have 3 negative integers the answer will be a..........

• Negative Number

• Positive Number

Multiple Choice

How many negatives are in this problem?

(-4) x 19 x (-2)=

• 1 negative number

• 2 negative numbers

• 3 negative numbers

• 4 negative numbers

Multiple Choice

If the problem is 12 x (-4)=

Then the answer will be a ...

• Positive Number

• Negative Number

Multiple Choice

If the problem is (-12) x (-4)=

Then the answer will be a ...

• Positive Number

• Negative Number

Multiple Choice

If the problem is 12 x 4=

Then the answer will be a ...

• Positive Number

• Negative Number

Now let's actually solve some! Remember, multiply like normal then count your negatives

Multiple Choice

12 x 2 =

• -24

• 24

• 48

• 32

Multiple Choice

(-6) x 8 =

• -48

• 48

• 54

• -54

Multiple Choice

(-20) x (-5)

• -120

• 120

• 100

• -100