Tuesday, March 15, 2011

Victoria's Final Percent Post, Cylinder & Volume Problems

A Percent is a number out of 100 or 100% . A hundred grid contains 100 squares, if you fill in 50 squares that is 50%. If you fill in 30 squares that would be 30%

4.1 Representing Percents.

To represent a percent, you can shade in squares on a hundred grid. A completely shaded hundred grid represents 100%. If the percent is greater than 100 you will have to shade more than one grid. To represent a percent between 0% and 1%, shade part of one square from the hundred grid.

4.2 Fractions, Decimals, and Percents

Fractions, decimals, and percents can be used to represent numbers in various situation.Percents can be written as fractions and as decimals.

4.3 Percent of a Number.

You can use strategies like halving, doubling, and dividing by ten to finds of numbers.
To calculate the percent of a number, write the percent as a decimal and then multiply by the number.

4.4 Combining Percents.

Percents can be put together by adding to solve questions.
To calculate the increase in a number, you can add the combined percent amount to the original number. You can multiply the original # by a single percent greater than 100.

a) V=( πxr^2 )x h
V=( 3.14 x 5cm ) x 23
b) V=( πxr^2 )x h
V= ( 3.14 x 14 ) x 12
c) V= (πxr^22 ) x h

1 comment:

  1. Good job, you summarized what the chapters in the textbook were talking about and you also used colour. Upload your video talking about those percent problems so you will get full marks!