Section C Section C Checkpoint

Problem 1

  1. What is 572 rounded to the nearest ten?
  2. What is 572 rounded to the nearest hundred?
  3. Is there a number that rounds to the nearest hundred as 300 and to the nearest ten as 240? Explain or show your reasoning.
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Solution
  1. 570
  2. 600
  3. No. Sample response: A number that rounds to the nearest hundred as 300 is at least 250. This means that 250 is the least the number can be rounded to the nearest ten.

Problem 2

  1. What is the least number that rounds to the nearest ten as 280? Explain or show your reasoning.
  2. What is the greatest number that rounds to the nearest ten as 280? Explain or show your reasoning.
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Solution
  1. 275. Sample response: Because 274 is closer to 270 than 280 but 275 is halfway between 270 and 280 and we round it to 280.
  2. 284. Sample response: Because if I add 1 more, then I get 285, which rounds to 290.