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anonymous
 one year ago
Annabelle and Navene are multiplying (4275)(4372).
Annabelle's Work Navene's Work
(4275)(4372) = 42 + 375 + 2 = 4577 (4275)(4372) = 42⋅375⋅2 = 46710
Is either of them correct? Explain your reasoning.
anonymous
 one year ago
Annabelle and Navene are multiplying (4275)(4372). Annabelle's Work Navene's Work (4275)(4372) = 42 + 375 + 2 = 4577 (4275)(4372) = 42⋅375⋅2 = 46710 Is either of them correct? Explain your reasoning.

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jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0Well, let's start with Annabelle, do you think she is correct?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0OK, let's check that gut feeling now. So, multiplication is repeated addition, right? That's why 3*70 is 70 + 70 + 70. So, do you think it makes sense that 4275*4372 = 4577 if you think about it this way?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0Basically, you are adding 4372 a bunch of times 4372 + 4372 + 4372 + 4372 + 4372 + 4372 + 4372 + 4372 + 4372 + 4372 + ... Seems like chances are slim that this will add up to only 4577... :)

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0Does that make sense? Do you still think Annabelle is correct?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0Maybe I should have spread out my questions. :) No, it doesn't make sense. Or no Annabelle is wrong?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0no annabelle is wrong

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0OK, great. I agree with that. :)

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0Now Navene is doing something a little different... but let's see what we think...

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0Before I go on, do you know the trick that if you multiply something by 10 you just add a 0 to the end? So, like 10*543 = 5430.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0OK, cool. To bust Navene's answer, I'm going to use a similar idea. I'll multiply by 100, which just adds two 0s instead of one. Look and see that (100)(4372) = 437200 this is already WAY bigger than Navene's answer of 46710. So (4275)(4372) has to be even bigger than (100)(4372). No way Navene, that's not right. Does that make sense to you?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so there both wrong , can you do me a favor and sum that up into a paragraph

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.2If there is something lime (a)(b) then it means a x b i.e, it means multiplication. So if we compare we can see that navene has expanded the problem properly but he has done some calxulation mistake due to which he gets the wrong answer

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.0Yes, they are both wrong. I'll let someone else take a shot at writing it up, but I think you can do it. Here are the main points: 1) Annabelle is wrong since multiplication is just repeated addition. 2) Navene is wrong since we know that multiplying by 100 adds two 0s. You can probably cut and paste from my previous explanations to make your own paragraph that makes sense to you. Show some calculations like I did to prove your point. Good luck!
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