Question

Which statement about the best estimation strategy for this problem is correct? Ms. Levy paid $189 for a hotel room and she bought two concert tickets priced at $99 each. How much money did Ms. Levy spend altogether? A student answered that Ms. Levy spent $576. A. ($200 + $100) × 2 = t The student's answer was reasonable. B. $200 + (2 × $100) = t The student's answer was not reasonable. C. $200 + ($100 ÷ 2) = t The student's answer was not reasonable. D. ($200 × 2) + $100 = t The student's answer was not reasonable.

Answer 1

B. 200 + (2 x $100) = t The student answer was not reasonable.
Because she spent $200 on the hotel which $189 rounded is $200.
$100 x 2 is 200 which is two $99's rounded (198)
Take 200 + 200 and you get 400.
For a bit of extra info she would have spent $400 rounded and $387 non-rounded.