Posted by steph on Tuesday, November 15, 2011 at 12:04pm.
A rectangle measures 30 feet by 20 feet and has a post at each corner. If posts are placed 2 feet apart. How many posts will there be in all?

3rd grade math  Writeacher, Tuesday, November 15, 2011 at 1:01pm
I would have to find a piece of graph paper and draw it out for myself! But let me see if this is right:
All totaled, there would be 100 feet of fencing, so it seems there would be 50 posts. BUT 4 of those posts (the corner posts) would be counted twice, right?
So is this right?
30+30+20+20 = 100
100/2 = 50
50  4 = ??

3rd grade math  bobpursley, Tuesday, November 15, 2011 at 1:19pm
If you start at one corner, it is 100 feet around, so each 2 feet place a post, or 50 posts.
To visualize this, sketch a 20x30 rectange, and place a post every 10 feet. Count the posts. You get 100/10=10 posts.

3rd grade math  luis, Monday, November 21, 2011 at 7:54pm
how many packages of ribbon will sarah buy?

3rd grade math  James, Sunday, June 3, 2012 at 9:06pm
I definitely know the answer to that one, luis. It's probably around 58,007,450 packages of ribbon.
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