# Thread: What Percentage was Removed?

1. The Jacket was 20 dollars it got reduced to 15 , by how much % did it reduced?
Thanks for any help, I'm lost

2.

3. First, how much was the reduction? What percentage of the original price is this?

4. Is it reduced by five dollars

5. Ok, so what fraction of the original price is 5 dollars?

6. 5/20

7. Ok, to convert that to the percentage reduction multiply 5/20 by 100.

8. is 1/4 0r 25%

9. That's it.

10. Million thanks to you and very good explanation was given

11. No problem. I'm a teacher, it's what I do all day

12. My wife, despite managing a \$million+ enterprise in her professional career, always struggled with percentages. Her most anxious moments came at budget time. Fortunately, yours truly was there to assist. In life I have met many who just can't comprehend it. Why? I can't tell you.

I picture Linon looking at his cell phone calculator suddenly realizing that no amount of button pushing is going to help when you don't understand or can't grasp it.

PhD: Do you allow calculators in your classroom or would you rather teach and have the kids work math questions out on their own?

13. We allow calculators as I teach A level chemistry and a bit of physics... Mental arithmetic (no matter how good) ain't enough as we regularly use logarithms etc... I do try and encourage them to do "order of magnitude" calculations in their heads though so at least they can spot if their calculator gives them a stupid number! For example I had one student today who calculated the mass of a magnesium ion to be of the order of 1026kg rather than 10-26kg an impressive factor of 10000000000000000000000000000000000000000000000000 000 out, but they faithfully wrote the number down!

14. Originally Posted by PhDemon
We allow calculators as I teach A level chemistry and a bit of physics... Mental arithmetic (no matter how good) ain't enough as we regularly use logarithms etc... I do try and encourage them to do "order of magnitude" calculations in their heads though so at least they can spot if their calculator gives them a stupid number! For example I had one student today who calculated the mass of a magnesium ion to be of the order of 1026kg rather than 10-26kg an impressive factor of 10000000000000000000000000000000000000000000000000 000 out, but they faithfully wrote the number down!
Don't know if that kid has a career in chemistry/physics.

15. They'll learn... it's only week 2 of the course

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