Dave's Percent post

Welcome to my Percent Post!!

Part 1- how to find key percentss

• 50%

When finding 50% of a number you have to divide a number into two equal parts.

(ex. 50% of 80 is 40.)

• 10%

When trying to find 10% of a number you will have to divide the number by 10 to get 10%.

(ex. 10% of 25 is 2.5)

• 1%

When trying to find 1% of a number, you have to divide the number by 100.

(ex. 100 divided by 100 = 1%)

• 25%

When trying to find 25% of a number, you would have to divide your number into 4 equal pieces. 

(ex. 25% of 200 = is 50)

• you also have to define what percent mean

Percent is a number out of 100.
ex. 30 percent is 30/100

Part 2    You need to have 3 images showing Representing Percents.  You choose the 3 but you could

180%)

         

                             














12 3/4%)

0.07%)


 Part 3)You need to explain how to convert from Decimals to Percents to Fractions.  Choose 3 sets

24%)
 You would have to divide the number by 100 to get the decimal. To get the percent you would have to get the decimal number and multipy that by 100. to find the fraction you would have to look at the last digit of the number to see what the place value is to know what your denominator is.
24 divided by 100= 0.24
0.24x100=24%
0.24==24/100

 7/10)
to find the the decimal you have to divide your number (7/10) to get 0.7 . to find the fraction look at the last number to see what place value its in so 0.7 . the 7 is in the 10s value so its 7/10. to find the percent you have to multipyl the decimal by 100 to get the percent. 0.7x100=70%

0.024 
to find the percent of this number you would have to multiply 0.024 by 100 to get the percent
0.024x100=2.4
to find the fraction you would have to look at the last digit to see what place it is 
0.024= 24/1000

part 4.  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
you would have to divide by 10
10%=6
10%=6
       =12

0.1% of 40
to find 1% of a number you would have to divide by 100 but if your looking for 0.1% of a number you would have to divide by 1000
40 divided by 100= 0.40
0.40 divided by 10=0.04

250% of 400

   Mental math
   100%=400
   100%=400
   50%=200
   400+400+200= 1000

    Calculator:
    400 divided by 100=4
    4x250=1000


part5

Discount - The discount is how much you take away from your original price and what you save.

Sale Price - The sale price is a new price on one item. So the original price has changed to a lower price, which is also the sale price. For example the original price was $75 and now it's $59

Total Prices with Taxes - The total prices are what you pay for after you have calculated how much you need to pay, then the taxes are the percentages that you have to pay for additional money, which usually depends on where you live. After you add the total prices and taxes together, that's how much you need to pay.

Textbook Question -
What is the sale price at each store? Which is a better buy?
Explain your thinking.
Store A: $350.99 is the original price and is 50% off one day only.
Store B: $375.00 is the original price and is 25% off one day followed by 25% off the reduced price the second day.

Store A -
day one
350.99÷2=175.50
Sale Price at store A is $175.50

Store B -
Day One,
375÷100
=3.75 x 25 
=93.75 
$375 - $93.75
= $281.25

Day Two,
281.25÷100
=2.81 x 25 
=70.25
$281.25 - $70.25
=$211


video link

http://www.youtube.com/watch?v=Im0VnXfYSns