Image Source: http://www.concordextra.co
The above 45 gram Chocolate Bar contains 25% Sugar.
How many Grams of Sugar are in this “Kit Kat” bar ?
Using Percentages, we know that Percent means /100, and so we can set up:
Grams of Sugar = ( 25 / 100 ) x 45 = 0.25 x 45 = 11.25 grams of Sugar.
Given that one teaspoon of granulated white sugar is equal to about 4.2 grams, our Kit Kat bar contains nearly three teaspoons of sugar.
Thanks to the Sugar, the chocolate bar tastes great, but each gram of sugar contains about 4 calories.
So to burn off the sugar in our Kit Kat bar we would need to burn off 4 x 11.25 = 45 calories.
In terms of Physical Exercise, a person of average weight would need to either skip for 3 minutes, or ride a bike at a fast speed for 3 minutes, or go jogging for 3 minutes to burn off these calories.
A great website for checking out how much sugar is in Food and Drinks is the following:
In this lesson we look at Finding the Percentage Amounts of items using Decimals and a Calculator.
The important thing to remember is that we are doing multiplication in these questions, and that “Percent” means divide by 100 or /100.
Steps for Finding Percentage Amount
To use Percentage to Find an Amount:
– Divide the Percentage by 100 to make a Decimal
– Multiply this Decimal by the Amount given
– Do NOT put a % sign on the answer.
Image Copyright 2012 by Passy’s World
Finding Percentage Amount Examples
The following examples show how to work out Percentage Amounts by first converting the Percentage to a Decimal.
Image Copyright 2012 by Passy’s World
Videos on Finding Amount Using Percentage
This video shows how to convert the % to a decimal, and then multiply by the number to obtain the answer.
Here is a video which shows some clever short cuts for calculating Percentage Amounts.
Percentage of a Number – Balloon Invaders
This game is like a Space Invaders type game to play, and is really fun.
Use the arrow keys to move the shooter, and space bar to shoot.
Click the link below to play this game.
http://www.mathplayground.com/balloon_invaders_percent.html
Percentages Mystery Game
This game is a movie mystery story with percentage puzzles along the way. Requires sound to hear the story.
Very well produced and entertaining.
Note that you need to mouse over area names on the map to find out how many squares they actually are.
Click the link below to play this game.
http://www.bbc.co.uk/bitesize/ks2/maths/number/percentages/play/popup.shtml
Related Items
Introduction to Percentages
Converting Percentages to Fractions
Converting Percentages to Decimals
Converting Fractions to Percentages
Converting Decimals to Percentages
Converting Percentages (All Types)
Calculating Percentages
Complementary Percentages
Percentage of Amount Using Fractions
Interesting Percentages
Percentages and Weight Training
Decimals and Percentages Games
If you enjoyed this post, why not get a free subscription to our website.
You can then receive notifications of new pages directly to your email address.
Go to the subscribe area on the right hand sidebar, fill in your email address and then click the “Subscribe” button.
To find out exactly how free subscription works, click the following link:
If you would like to submit an idea for an article, or be a guest writer on our blog, then please email us at the hotmail address shown in the right hand side bar of this page.
Feel free to link to any of our Lessons, share them on social networking sites, or use them on Learning Management Systems in Schools.
Enjoy,
Passy
Pingback: Percentage Discounts | Passy's World of Mathematics