Robson's Integers Scribe

This is what we learned in class.

Chips

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If a positive is lined up with a negative it creates a zero pair canceling those 2 out.

In this equation there are 2 negatives and 2 positives. (+8) + (-2) this will leave you with +6.

We learned that you cant do this you have to use "Have" for positive and "Owe" for negative.

So right now you "Have" 6. This equation is for little kids, we need to use a grown up equation a grade 8 one. To do this you have to do 8 + (-2) you don't need a positive sign after every positive number because it is not necessary.

 Number Line

In class we learned about number lines. <-------------0--------------> This is a number line.

So for example we use this equation and we use the number line method to solve it. ( 8 + (-2) )

This is what you need to do for a number line                     

                                                                                8--------> 

                                                                                             <-- 2 

                                                                              0--------6-----------> 

This equation leaves you with 6

This is how you do a number line.

Estimating and Calculating Integers

(69)x(-11) = -700 EST

(69)x(-11) = -759 CALCULATED

How i got this number is a mystery. I got the estimated number by breaking down the number by turning the 69 into a 70 and the 11 into a 10 its really simple. Now to imply the sign rule, since the there are different signs Positive x Negative the product will automatically turn into a negative product.

                                       

                                                                                                                                                                           

Robson's Percent Post

*Percent means out of 100, it is an equivalent fraction that is out of 100.

*Here is how we find-
  10 out of a hundred-10/100-All you have to do is divide 100 by 10.
  Half Of 100 50/100-You divide 100 by 2 because 50 is half of 100
  Quarter of 100-25/100-Divide 100 by 4 because 4 25's is 100 so you do the opposite
  One out of a hundred-1/100-You divide 100 by 100 because if you divide any number by itself you will get 1.

*Percent is Latin for percentum or per 100. We can also use French, Per=out of and cent=100.
*Why percents revolve around 100 is a very hot topic, my genius has helped in figuring it out. We use 100 because it is a friendly number and is and easy number to use better than using the number 69.
*You can also go above the 100/100 barrier by doing something like 205/100. This form of fraction is called top heavy or an improper fraction. For every 100 in 205 it will equal to 1 whole making this 2 wholes and 5 hundredths.
*You may see 100 in % because there are zeros on both sides of the fraction line and the fraction line somehow represents 1.
*We can use simple things for fractions we can use apples.
40 Apples  100 Percentage               What you do on one side you have to do to the other.    
40/4=100     100/4=25
40/10=4       100/10=10
40/100=0.4  100/100=1
40/1=40       100/1=100

2. *180%-

   *12 3/4% - 

  *0.7%- 

 

Converting Fractions,Percents and Decimals

Converting fractions to percent and decimals


5/40
To turn this fraction into a decimal you have to divide the numerator by the denominator.
ex. 5÷40=0.125
To turn this decimal into a percent you have to multiply the decimal by 100.
ex.0.125 x 100 = 1.25
Now you must be confused by my amazing math. This is how I did it.
0.125 over 1. 0.125 x 100 now what you do to the numerator you do with the denominator so
0.125 x 100 now since 0.125/1 you have to multiply the 1 by 100 so 100.
now its 12.5 over 100 12.5/100.

Converting decimals to fractions and percents

0.070
To turn this decimal into a fraction you have to figure out which place value this number i in.
ex. 0.070/1000
Now you have to multiply the numerator by the digits of the numerator.
ex. 0.070 x 1000= 70
This forces the decimal into a "regular number".Now you have to divide this number by 2 and do the same for the denominator.
ex. 70÷2=35/1000÷2=500
You cant go any further because you cant divide 35 by 2 and get an even number.
To turn fractions into percents you have to divide your numerator by your denominator.
ex. 35÷500=0.07 
Now you have to multiply this number by 100.
ex. 0.07 x 100 = 7%

Converting percents to decimals and fractions

40%
To turn this percent into a decimal you have to divide your percent by 100
ex. 40÷100= 0.4
Now to turn this decimal into a fraction.
You have to multiply the decimal by 100.
ex. 0.4 x 100 =40/ 100
40/100

Percent of a Number

*Percent of a number is the next part of this exercise. Show how you could solve the following using mental math and a calculator

*20% of 60 - 20% ÷ 100 = 0.2 x 60 =12

*0.1% of 40 - 0.1% ÷ 100 x 40 = 0.001 =0.04

*250% of 400 - 250% ÷ 100 = 2.5 x 400 =1,000

Combining Percent

*Combining Percents is the last part of this post. You need to explain Discount, Sale price and Total Price with taxes. I also need  you to explain what is better deal 50% off or 25% off of an already reduced price of 25% This can be done using the following Questions,

No 25% and 25% combined are not the same as 50%. This is not the same because if you calculate 25 divided by 100 then multiply by the price. ex. 25 ÷ 100 x 150 =$37.50 - 150 = 112.5

Now it's a reduced price you have to drop the price by 25 again 25 ÷ 100 x 112.5 = $29.25 - $112.50=  $83.25

50% of 150 - 50% ÷ 100 x 150 =$75.00

$75.00 < $83.25

$75.00 is a better deal because it costs less than $83.25

*0.6%

                             








*12.3/8