Proportions and Percent Equations

Topics for Today:

We expanded our discussion of proportions to include the percent proportion. We deconstructed the word per-cent to mean "out of 100". We can solve percent problems using a proportion or using a percent equation with the percent expressed as a decimal.

This unit will continue to explore proportions and percents, and we'll take some time to review the conversions of fractions to decimals to percents and vice-versa. Students will be encouraged to memorize the decimal equivalents of common fractions as a time-saver. Normally I am not a big fan of memorization, unless it serves a useful purpose - memorizing common concepts (like divisibility rules, the quadratic formula, and common numbers) can be a big time-saver leaving more time for higher order problem solving.

Vocabulary:

percent, percent proportion

Sections Covered in Textbook:

6-5: Solving Percent Problems Using Proportions (pages 311-317)

Resources & Tutorials:

1) What is a percent proportion?
2) How do you use a proportion to find a whole?
3) How do you use a proportion to find what percent a part is of a whole?
4) How do you use a proportion to find part of a whole?

5) Proportions and Percent Equations Class notes