Friday, March 25, 2011

Olivia's Great Big Book of Integers

Chapter 1
Grade 7 Integer Review
Integers can be represented with a number lines or integer chips.

integers are usualy represented with two colors red and blueNegative - Blue
Positive - Red

Zero Pairs - a pair of negative and positive numbers and the sum is zero.

ex. (-3) + (+3) = 0.
This is a rhyme you should sing to yourself during a test if you can't remember when to use a zero pair.
When subtracting something that isnt there, use a zero pair.

In grade 7 we did integers like this
(-3)+(+7)= the thing about doing integer in grade 7 is there is brackets.

Here are some questions:

13. a)(+4)x(+6)=24
d)( -8)x(-2)=16

Chapter 2
multiplying integers

Here are some questions we did.
10. a(17)x(-24)= -408

For a multyplycation question that needs a zero pair you can see how many zero pairs you need by multiplying the two factors in the question without their negative or positive signs.

ex. (-2) x (+3) - 2 x 3 = 6

chapter 3
Dividing Integers

Partative Division or groups of, If you know the number of groups, but you dont know the number in each group then that is partative division.

6 groups of 2

2. 3÷2=1.5
3 groups of 2

Quotative Division

If you know the number that is in each group, but you dont know the number of groups then that is quotative division.

1.(-6)÷(2)= -3

another way to mutiply intgers is multiplicated-inverse


-In a division question with an even amount or no (-) signs the quotient will be positive.
-In a divison question with an odd amount of negative signs the quotient will be negative

Chapter 4

Order of operation with integers

(+5) x (-3) + (-6) / (+3) =

To do order of opration u won't to follow the rules of B.E.D.M.A.S. Brackets, Exponents( except there are no exponents in bedmas) , Division, Multiplication, Addition, Subtraction.

First add square brackets around the expressions with a x or / to help remind you to answer them first. The square brackets means that you should answer the question in them before doing anything else.

1.-6-9+10-1= -6

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