Carlo's scribepost

Dividing integers
Sign rule
1. The product of two integers with the same sign is Positive.
2. The product of two integers with different sign is Negative. 

Ex:
 

Multiplicative Inverse
In Multiplicative Inverse you don't need to use pictures.
Ex:

Here's a video to help you divide integers

Jessica Da Silva's Dividing Integers Scribepost

Rules for dividing integers.

1. The product of two integers with the same sign is positive, or if there is an even amount of negative integers, the product is positive.

2. The product of two integers with different signs is negative, or if there is an odd amount of negative integers, the product is negative.

Examples:

Here is a video of dividing integers:




Here is a link of dividing integers as well.

Gian's Scribe Post

[8.2] Multiplying Integers.

4.]

a.]  [+2] x [-3]

b.] [+3] x [+4]

6.]

a.] +42

b.] -32

c.] -45

d.] +110

7.]

a.] +162

b.]-480

c.]-708

d.]+1764

8.]

a.]-40

b.]+5

c.]-2

d.]+9

e.]+7

9.]

a.] A customer would save $60 over two years.

b.] The Internet provider would lose -$30 annually for each customer who makes this choice.

Fiolo's Scribe Post

Dividing Integers Rules:
When you divide two integers with the same sign, the result is always positive. Just divide the absolute values and make the answer positive.

Positive ÷ positive = positive
Negative ÷ negative = positive

Example: 12 divided by 4 equals 3

How many groups of 4 are in 12? Share with 4 groups.

When you divide two integers with different signs, the result is always negative. Just divide the absolute values and make the answer negative.

Positive ÷ negative = negative

Negative ÷ positive = negative

Share (-12) with 4 groups.

Multiplicative Inverse
You don't need to model.

12 divided by -3 = -4
-4 x -3= 12

Here's a link about dividing integer.
http://www.youtube.com/watch?v=2QJCOnStpy0

Stephen's Scribe Post

4
a. (+12) dividing (+60)=+2
b.(-15) dividing (-3)=+5
c.(-8) dividing (+4)=-2
d.(+9) dividing (+3)=+3

5.
a.(-10) dividing (+2)=-5
    (-10) dividing (-5)=+2
b.(-16) dividing (-2)=+8
    (-16) dividing (+8)=-2
c.(+6) dividing (+3)=+2
    (+6) dividing (+2)=+3

6
a. (-12) dividing (+4)=-3
    (-12)  dividing (-3)=+4

7
a. (-14)  dividing (-7)=+2
b.(+18)  dividing (+9)=+2


11.Penelope gets  a pay cheque of $750 every two weeks.If she works Monday to Friday, how much is earned each day? Use the division of two integers to represent this situation, then solve.
Answer : (+750)  dividing (+10):$75

Nicole's Multiplying Integers Scribepost

I agree with Justin for the first part because if you multiply a positive integer by a negative integer it would me a negative integer.
But for the second part I don't agree because it would be positive if you remove 5 by a negative number.





a) (+2) x (+4) = +8
b) (+3) x (-5) = -15

(If the integer signs are the same the product is positive, if the integer signs are different/opposite the product is negative)

a) (+10) x (+4) = +40

b) (+6) x (-5) = -30

c) (-7) x (+5) = -35

d) (-8) x (-4) = +32

 

I couldn't find a link, so

 

Here is the Multiplying Integers song :)

 



Aj's scribepost

textbook pages 296-297


1.) Darcy modeled (+7) x (+3) on a number line by drawing seven arrows. Ishnan modelled (+7) x (+3) on a number line by drawing only three arrows. explain ishnan thinking.

Answer:
Ishnan thinking is wrong because the right answer is positive 21 but if he draw only three arrows the answer will be positive 9.

5.) what multiplication statement does each diagram represent?

The answer is (+2) x (-6)= -12


5.B)

The answer for this question is (+4) x (+4) = +16


7.) Determine each product.
  a.) (+4) x (-7)   b.) (+2) x (+9)

answers:

A.)  In this question I solve this by using number line. the answer for this question is -28.

B.) In this question i answer this by number line. the answer for this question is -18 because 2 groups of 9 is 18.