
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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August 14th, 2018, 11:03 AM  #1 
Member Joined: Aug 2018 From: Warrington Posts: 50 Thanks: 1  Working out perimeter of an envelope
You need a padded envelope to post the frame and photo. Work out the perimeter of the padded envelope below. 
August 14th, 2018, 11:06 AM  #2 
Member Joined: Aug 2018 From: Warrington Posts: 50 Thanks: 1 
I have worked the perimeter out as 20 cm x 2 = 40 cm then 25 cm x 2 = 50 cm then add 40 cm and 50 cm = 90 cm. This is the correct way to work this out? 
August 14th, 2018, 12:00 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 19,882 Thanks: 1835 
It's correct. Another correct way would be to add 20 cm to 25 cm, which gives 45 cm, and then multiply that by 2 to get 90 cm.


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