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We are a group of 7th graders from Colorado who want to practice our writing and communication skills. We are excited to expand the walls of our classroom and collaborate with other classes! Please leave us comments and your blog URL, so we can respond back to you!


teacher: Mrs. Lubich

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Fun with Math

A man was making donuts for the offices. There are 7 offices, and he wants to make 13 for each of them, but he baked 28 donuts. He is sure that 13 X 7 = 28, but simple multipication states that 4 X 7 = 28. He has a method to his madness, though. First, he divided 28 by 7. As you know, 7 does not go into 2 (as in 28). So, instead of putting 7 directly into 28 like he should have, he put 7 into the 8 in 28. 7 goes into 8 once. He wrote 1 off to the side. Then, he proceded by dropping down the 2 in front of the 1, making 21. 7 goes evenly into 21 three times. He wrote 3 after the 1. 13! Then, to make sure he was right, he added 13 seven times. He added all the 3's in the one's place and got 21, like he was supposed to. Then, he proceded to add the 1's in the ten's place, but he added them as if they were in the one's place. 22, 23, 24, 25, 26, 27, 28! His final answer was 28! He used 2 ways to prove that 7 X 13 = 28!   

Article posted September 20, 2011 at 08:32 PM • comment • Reads 48 • Return to Blog List
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