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Learn all about calculating percentages! Click on the Percent Symbol to enter!

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Presentation on theme: "Learn all about calculating percentages! Click on the Percent Symbol to enter!"— Presentation transcript:

1

2 Learn all about calculating percentages! Click on the Percent Symbol to enter!

3 Try again!

4 What do you remember about percent? Great Job! You’re right, the percent symbol looks like this: %

5 Does percent mean “out of 100” or “out of 1000?” 75 out of how many would be 75%? 3/4 or 3÷4 equals 0.75 or 75% Does this give you a hint? Click on the questions to answer them

6 Does percent mean Out of 100 Out of 1000 Click on the correct answer

7 Percent means out of 100! For example: 25 out of 100 is 25% OR 67 out of 100 is 67%

8 Try Again!

9 75 out of how many is 75%?

10 Click on the rat to try again

11 75 out of 100 means 75/100 in fraction form and both are 75%! Click on the sun to keep going

12 What can you use percent for? Percent helps us to be able to talk about things and compare them!

13 For Example: What do you think kids like better, peanut butter and jelly or brussel sprouts? mmm…

14 If we read that about 1,900,643 out of 2,245,635 students liked to eat peanut butter and jelly, but only 12,635 out of 95,200 liked to eat brussel sprouts, we might say, “oh, let me think about that …” or “What?!”

15 However, if we read that about 85% of students like peanut butter and jelly, but only about 13% like brussel sprouts, we would probably say – “well, yeah…duh!...of course!” Percent can make big ratios easier to understand and talk about.

16 Let’s learn how to calculate percentages: The trick is figuring out which numbers are the part, the whole and the percentage. If you’re trying to find 75% of 80, it’s pretty easy to tell that 75 is the percent and 80 is the whole number. How does this help?

17 You can use the same equation for calculating percentages no matter what you are trying to find! Percent x whole = part So…Is 80 the part or the whole when trying to solve “What is 75% of 80?” PartWhole

18 Think about it. 75% is part of 100% and the question asks, 75% of 80 is ? So the number matched with 75% is the part and the percent matched with 80 is the 100%. 80 must be the whole.

19 Yes, 80 is the whole and we are trying to find the part! So….75 x 80 = part 75% of 80 is: 24? 52? 60? Click on the correct answer

20 Think about it. 75% is more than half, right? Is 24 more than half of 80?

21 75 is ¾ right? What is ¾ of 80? What is ¼ of 80? Divide 80 by 4. Multiply that number by 3.

22 Let’s look at another kind of problem! 28 is 40% of what number? Which equation(s) would be correct? Remember – Percent x whole = part 28 ÷.4 = ?.4 × 28 = ?.4 × ? = 28

23 .4 x 28 is the expression for finding the part. In this case 28 is the part. 28 is 40% of what number? We are trying to find the whole!

24 Both the equation 28 ÷.4 = ? and the equation.4 x ? = 28 are correct! Percent x whole = part Part ÷ whole = percent Part ÷ percent = whole

25 Now you just have to figure out which part is the part, which is the percent and which is the whole! All it takes is a little practice and you’ll be a percentage whiz!


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