In this unit we learned about percents. Percent means out of 100 s0 percents are always out of 100. We learned how to represent percents using 100 grids, you can convert percents into decimals or fractions, you can find a percent of a number, and you can combine percents to find things like the total cost of an item including tax.
4.1 Representing Percents
In this unit we learned how to represent percents using hundred grids. For example, if you have 30% you can represent this by shading in thirty squares in the hundred grid. Or if you have 250% your can represent this by shading in 2 hundred grids and fifty squares in another hundred grid. If you want to represent 0.25% or 1/4% you shade in part of one square and then have an arrow pointing to a square representing 1/4.
4.2 Fractions, Decimals, and Percents
We also learned how to represent percents by using decimals or fractions. We learned how to convert fractions into decimals and percents(EX: 1/4=0.25 or 25%) we learned how to convert decimals into percents and fractions (EX: 0.25x100=25% 1/4) and also converting percents into decimals and fractions.
4.3 Percent of a number
We learned how to find a percent of a number using mainly ratio tables. Another way to find a percent of a number is by turning the percent into a decimal by dividing it by 100 and then multiplying it by the number. For example: 65% of 250 0.65x250=162.5.
4.4 Combining Percents
We can combine percents when solving problems, such as finding the added tax to the cost of an item. It can be also used for finding discounts on prices. For example: GST + PST=12% tax, original price is $40 so $40x1.12=$44.80.
This is my Video on Percents:
Here's a Link about percents: http://www.mathgoodies.com/lessons/toc_vol4.html
I hope you enjoyed my video!