Maths: Decrease in percentage

Hello visitors to my blog! I'm posting this because I've posted "Increase in percentage" post, here's the link to view the post:http://revisioning-blog.blogspot.com/2011/03/maths-increase-in-percentage.html

Ok so basically it's the reverse. I'm using the same question in the post, but just change the conditions so the question will be about the decrease in percentage. Please stop the music if you find it annoying, hehe....

So here's the question: The temperature of a piece of metal was 36 degrees. It was then lowered into a glass of cold water and the temperature of the piece of metal decreased to 32 degrees. Find the percentage decrease in temperature of the piece of metal. Round it off to 1 decimal place.


Solution(2Steps):


1st step: Find the difference between 36 and 32.
36-32=4
2nd step: Put 4 over 36 and multiply it by 100%.
4/36 x 100% =(approximately) 11.1%


So here's your answer: 11.1% This post is like introducing short-cuts to Maths questions....