Nikki's Percent Post

Sorry for it being so late. Just chose a 4 questions from page 142-143.

4. Use mental math to answer the following:

a) 20% of 60%

20x3=60. So the answe of 940r is 12.

b)250% of 400%

My math shows 250% of 400 is 1000%.

c)10.5 % of 100%

I came up with is 10.5% out of 100%. My answer is 10.5.

5.Determine the percent of each number. Give your answer to the nearest hundredth.

a)2/5% of 325%

2 Thirds of 325 is 1.3% repeating.

b)15 1.4% of 950%

I got:

15 1.4 of 950=144.88%

c)175% of %125.50

$291.63

7. Two Hundred tickets are being sold at a school draw.

a) What are your chances of winning the ticket? Explain with a percent.

100/1=1

200/1=0.5%

So you have one half of a chance of winning your school draw ticket.

b) How many tickets would you need to purchase to have a 2.5% chance of winning?

200/1=0.5%

0.5x5=2.5%

You would have to buy 5 tickets to be able to have a 2.5% chance to win the school draw.

14. 4% of 100% is the same as 8% of what number? Explain how you arrived at your answer.

4% is half of 8%. 100% divided in half is 50%.

Sorry for not explaining all of my work.

http://www.wonderhowto.com/how-to-calculate-percentage-288417/

^^

Here is a short video reminding you how to CALCULATE percents.

Final Percent Post (late)

Percent : it means out of 100 and it can also represent as a fraction or a decimal.

4.1 Representing Percents:

• To show a fractional percent between 0% and 1%, shade part of one square.
• One completely shaded grid represents 100%
• Means showing a percent as a picture in a hundred grids.

4.2 Fractions, Decimals, and Percents:

- Can be used to show numbers in different situations.

- Percents can be written as fractions and as decimals.

4.3 Percent of a number:

• · To calculate the percent of a number, write the percent as a decimal and then multiply by the number.

• · We can use mental math techniques such as halving, doubling, and dividing by 10 to find the percents of some numbers.

  Example: 12 1/2 % of 50 = 0.275 x 50

  = 13.75

  Percent Video Questions:

  4.4 Combining Percents:

· Percents can be put together by adding to solve problems.

Example: 5% + 7% = 12% ( We always use 12% as tax in our case)

· You can multiply the original number by a single percent greater than 100.

Example: 155% of 100 = 1.15 x 100

· You can add the combined percent amount to the original number.

Example: 15 % of 100 = 0.15 x 100 = 15

I'll upload the video later.