3.4 Decimals and Percents (p.68-69)

I. Percent means "per hundred"
A. Percentages are another way to talke about having a fraction of the whole or part of a whole
1. If you have all of something you have 100%
2. A percentage is like dividing a whole into 100 equal parts then showing how many of those parts you have out of the 100.

II. Converting a decimal to a percent.
1. Move the decimal point two places to the right
a. this is the same as multiplying the decimal by 100 -> turning the whole from 1 equal part into 100 equal parts
2. Put a percentage (%) symbol at the end of the number

III. Changing a percent into a decimal
1. Remove the percent symbol (%)
2. Move the decimal point two places to the left
a. this is the same as dividing by 100 - turning the whole from 100 parts into 1 part

Try this matching game from Harcourt math.