Angie's Percent Post

A percent is an equivalent fraction out of 100.

100% means 100/100

To find 100% you divide by 1.

50% means 1/2 or 50/100

To find 50% you divide by 2.

25% means 1/4 or 25/100

To find 25% you divide by 4.

10% means 10/100

To find 10% you divide by 10.

1% means 1/100

To find 1% you divide by 100.

Representing Percents

180%

0.6%

12 3/4%

Converting Percents, Fractions and Decimals

3/40- First you divide the numerator by the denominator. Then you multiply the decimal by 100 to get your percent. 

3 divided by 40 = 0.075

0.075 x 100 = 7.5%

5.98- First you multiply by 100. To find the fraction, you count the amount of digits there are. In this case there are 3.

5.98 x 100 = 598%

The fraction would be 598/100.

750%- First you divide the percent by 100. You divide by 100 becausena percent is equivalent to 100 so you have to do the opposite operation.

750 divided by 100 = 7.5 

In this case, it would be 7 1/2. 

Show How You Know

20% of 60

20 divided by 100 = 0.20

0.20 x 60 = 12

20% of 60 is 12.

0.1% of 40

0.1 divided by 100 = 0.001

0.001 x 40 = 0.04

0.1% of 40 is 0.04.

250% of 400

250 divided by 100 = 2.5

2.5 x 400 = 1000

250% of 400 is 1000.

Question 3 on page 148

A. 15 ÷ 100= 0.15, 0.15 x 200 = 30, 30 + 200 = 230

B. 10 ÷ 100 = 0.1, 0.1 x 230 = 23, 23 + 230 = 253

C. 25 ÷ 100 = 0.25, 0.25 x 200 = 50, 50 + 200 = 250

Kyle is incorrect. 

A Discount is what you save.

A Total Price is what you pay altogether including tax.

A Sale Price is what you pay.

Show How You Know on page 148

Which is a better buy? What is the final price?

Plate collection - $68.00

Store A - 50% off one day only

68 ÷ 2 = $34

Store B - 25% off one day followed by 25% off the reduced price the second day

25 ÷ 100 = 0.25

0.25 x 68 = $17

$68 - $17 = $51

$51 x 0.25 = $12.75

$51 - $12.75 = $38.25

Store A is a better buy.

Video:
http://www.youtube.com/watch?v=LQUy83xFL5E