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math

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Tina solved for the decimal value 0f
(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 - ,

    C is correct. It is more exact than D.

  • math - ,

    ok thank you for explaining that.

  • math - ,

    You're welcome.

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