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September 16, 2014

September 16, 2014

Posted by **Ellie** on Friday, March 29, 2013 at 8:29pm.

(3/5*18) and got an answer of 5.4. Four of her classmates argued that her answer was not reasonable. Which of the following statements best explain why that value can not =5.4

A. the number 18 is a multiple of 3 , so the answer must be a whole number

B. The number 18 can be rounded to 20 and 3/5 can be rounded to 1, so the value of (3/5*18) must be less than 20*1, or 20

C. the fraction3/5 is greater than 1/2, so the value of (3/5*18) must be greater than 1/2 of 18 or 9

D. The fraction 3/5 is less then 1, so the value of (3/5*18) must be less than (1*18) or 18

I think it is D.

I did 18*3/5=104/5=54/5=10.8

I really wasn't sure if C or D was the better answer since to me they are both correct.

Can you help explain? thanks for your help!!

- math -
**Ms. Sue**, Friday, March 29, 2013 at 8:42pmC is correct. It is more exact than D.

- math -
**Ellie**, Friday, March 29, 2013 at 8:56pmok thank you for explaining that.

- math -
**Ms. Sue**, Friday, March 29, 2013 at 9:04pmYou're welcome.

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