Let's solve some more percent problems using proportions.

In this tutorial we will be solving problems involvingpercentages. Since we are still problem solving, I will use Polya’s four steps toProblemSolving as introduced in to step us through thepercentproblems in this tutorial. It is a good idea to be comfortable workingwith percents, you never know when you will be confronted withthem. Let's see how we can help you out with percents.

This video covers how to solve percent problems using proportions.

Using ratios to solve total-from-part and part-from-part percentage problems.
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This lesson shows three ways to solve percent problems.

For a complete lesson on percent word problems, go to - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn to solve "percent" word problems, such as the following. What is 24% of 175? Note that "what" means "x", "24%" means "24/100", "is" means "equals", "of" means "times", and "175" means "175". So this word problem can be translated into the equation x = 24/100 times 175.

Proportions can be used to solve percent problems.

The format displayed above, "(this number) is (some percent) of (that number)", holds true for percents. In any given problem, you plug your known values into this equation, and then you solve for whatever is left.

You can solve a lot of percent problems using the tricks shown above. But what about this problem?
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Practice solving word problems involving percents.

In math, a percent is shown as a number compared to 100. Solve percents and proportions with tips from a math teacher in this free video on solving math problems.

Expert: Nancy Johnson
Bio: Nancy Johnson works for Santa Clara County School District as a high school math teacher.
Filmmaker: Bing Hu

How to Solve Percent Problems - dummies

In this problem, we are asked to compute the ratio of female football players to all football players expressed as percentage. To compute the ratio, we need to know the number of football players and number of female players. However all we see in the problem are some percentages. The trick to answering this question is that the answer is also expressed in percentage terms and therefore you do not need to know the exact numbers. In fact this problem can be easily solved by assuming the total number of students to be 100. Why 100? Because it’s a nice round number and easy to perform percentage calculations.

Percent and Problem Solving - West Texas A&M University

percentage word problems

How to use Youtube for Instruction
-math
-chemistry
-physics
-programming
-electronics
-construction
-plumbing
-farming
-etc.

Schools and government providing online instruction already:
MIT
Harvard
Columbia U
Berkeley...

Check out Youtube User: PublicResourceOrg

Private Individuals:
search for:
Kahn Academy

Why is it good for education quality?

Ask yourself, why would you want to listen to a third rate instructor when you can have inventors, doers, problem solvers, maybe a few PhDs give the lecture?

and yet... our students are leave schools unchallenged and often unthinking and unprepared. Is it because the lecturers were bad/poor quality?

Why are there so many problems in the world?

Our schools around the world are producing less than qualified thinkers and problem solvers...

Who to blame?
Teachers?
Students?
Parents?
Culture? (That's the number one cause IMHO)

Solution?

Easy...

Students and teachers publish their instruction and
their learning...
With transcriptions, education will be accessible to everyone... if only Youtube will make the transcription tools more Wiki like...

The rise of a meritocracy.
People will quickly see who are the best teachers and the best students.

Materialistic rationale (for individuals) to improve local education in the United States:

If you own property in the US you want to be located in good school districts, right? Why? Answer:Your home value goes up because people want to live in areas where their children have access to the best education...

But what if quality education was distributed throughout the world? Then we'd all enjoy the wealth that educated problem solvers bring to the (world) community...

How:
Screencasts are easy to make... and the software is free.

Computers are too expensive? In the US?

Linux Terminal Servers Thin clients for less than $50 each...

Why hasn't it happened yet?
Why don't teachers use more computers in the classroom? Maybe because a teacher that knows how to use a computer can find a higher paying less stressful job relatively easily?

So to sum up:
Teacher: how to use Youtube in your course work... as a lesson?
-teacher poses questions
-students respond
-teacher creates instruction
-students create instruction and evidence of problem solving which is then held up for review to all
(meritocracy should rule)