Slide 1

Multiply and Divide Integers7th Grade mathOctober, 2013Next Clean Page of Notes!!!Title Multiplying IntegersDate September 24, 2013Multiplying IntegersEasy, breezy, lemon, squeezy!!

Read

Model the following problem on the number line:4 2

Remember: Multiplication is repeated addition. So, 4 2 is equivalent to 2+2+2+2 (4 groups of 2)Read and AnalyzeModel the following problem on the number line:-3 2

Remember: Multiplication is repeated addition. So, -3 2 is equivalent to -3 + -3 (2 groups of -3)

Read and AnalyzeMultiplying Integers Notes- Complete- Cut out- paste in notebook

Complete and add to notebookDevelop a Rule Activity

DO NOT GO ANY FURTHER UNTIL YOU HAVE DONE THIS ACTIVITY

Complete before moving on!So, Whats the Rule?If the factors have the same sign, your product is POSITIVE.If the factors have a different sign, your product is NEGATIVE.

SAME SIGN = POSTITIVE ProductDIFFERENT SIGNS = NEGATIVE Product

Add Rule to Notes

Multiplying integers

Check your answers on next slide -3 x 8 =2.-12 5 =

3.42 -74.- 7 x -15 =

5.-11 (- 8) =6. (-4) (-5) (-8) =

7.47 2 =8.3 (-2) 4 =

9.-3 (- 6) =

Add these examples to notes9For each example ask pupils what sign the missing number will have and then what the number is.Links:Mental methods multiplication and divisionEquations solving equations

Multiplying integers ANSWERS!!-242.-60

3.-2944.105

5.886. -160

7.948.-24

9.18

10For each example ask pupils what sign the missing number will have and then what the number is.Links:Mental methods multiplication and divisionEquations solving equations

Independent PracticeGlencoe Skills Practice2-6

Additional Practice:If needed, Glencoe Practice 2-6Mastery, Integer Maze Glencoe 2-6

Dividing integersFact Families:Using multiplication and division, show the fact families for the following problems.

8, 2, 163, 9, 274, 5, 20

8, 2, 163, 9, 274, 5, 202 8 = 163 9 = 274 5 = 208 2 = 169 3 = 275 4 = 2016 2 = 827 9 = 320 4 = 516 8 = 227 3 = 920 5 = 4Develop a RuleUse your Fact Family organizer to develop a rule for dividing signed numbers.

1. - 6 (4) =4 (- 6) =

2. 7 x (-3) =(-3) x 7 =

3. - 9 - 4 =- 4 - 9 =

Dividing integersCut out the house you have not used.Glue it into notebook.Lets work with the following numbers to complete a fact family house.8 -3 =

What rule did you develop?

So, Whats the Rule?If the dividend and divisor have the same sign, your quotient is POSITIVE.If the dividend and divisor have a different sign, your quotient is NEGATIVE.

SAME SIGN = POSTITIVEDIFFERENT SIGNS = NEGATIVE

(LOOK FAMILIAR?!?!?!!)Practice Problems55 (- 5)

-16 (-4)

32 - 8

-63 (-7)

-81 9

Independent PracticePage 116 - #1-8