Section C Section C Checkpoint

Problem 1

Use a >, <, or = symbol to make each statement true. Explain your reasoning.

  1. 4121113\frac{4}{12} \, \underline{\phantom{\frac{1}{1}\hspace{1.05cm}}} \, \frac{1}{3}

  2. 5310011512\frac{53}{100} \, \underline{\phantom{\frac{1}{1}\hspace{1.05cm}}} \, \frac{5}{12}

  3. 265100112810\frac{265}{100} \, \underline{\phantom{\frac{1}{1}\hspace{1.05cm}}} \, \frac{28}{10}

  4. 1381175\frac{13}{8} \, \underline{\phantom{\frac{1}{1}\hspace{1.05cm}}} \, \frac{7}{5}

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Solution

Sample responses:

  1. 412 = 13\frac{4}{12}  \, =  \frac{1}{3}, because 13\frac{1}{3} is the same as 1×43×4\frac{1 \times 4}{3 \times 4}, which is 412\frac{4}{12}.
  2. 53100>512\frac{53}{100} > \frac{5}{12}, because 53100\frac{53}{100} is more than 12\frac{1}{2}, and 512\frac{5}{12} is less than 12\frac{1}{2}.
  3. 265100< 2810\frac{265}{100} < \frac{28}{10}, because 2810\frac{28}{10} is 280100\frac{280}{100}.
  4. 138>75\frac{13}{8} > \frac{7}{5}, because if I take away 1 from each then I have 58\frac{5}{8} and 25\frac{2}{5}. I know 58\frac{5}{8} is greater than 12\frac{1}{2}, and 25\frac{2}{5} is less than 12\frac{1}{2}.
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Sample Response

Sample responses:

  1. 412 = 13\frac{4}{12}  \, =  \frac{1}{3}, because 13\frac{1}{3} is the same as 1×43×4\frac{1 \times 4}{3 \times 4}, which is 412\frac{4}{12}.
  2. 53100>512\frac{53}{100} > \frac{5}{12}, because 53100\frac{53}{100} is more than 12\frac{1}{2}, and 512\frac{5}{12} is less than 12\frac{1}{2}.
  3. 265100< 2810\frac{265}{100} < \frac{28}{10}, because 2810\frac{28}{10} is 280100\frac{280}{100}.
  4. 138>75\frac{13}{8} > \frac{7}{5}, because if I take away 1 from each then I have 58\frac{5}{8} and 25\frac{2}{5}. I know 58\frac{5}{8} is greater than 12\frac{1}{2}, and 25\frac{2}{5} is less than 12\frac{1}{2}.

Problem 2

Clare walked 45\frac{4}{5} of the way around a lake. Tyler walked 712\frac{7}{12} of the way around a pond. Explain why you don’t have enough information to determine who walked farther.

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Solution

Sample response: I know that 45\frac{4}{5} is greater than 712\frac{7}{12} because 45\frac{4}{5} is close to 1 (or is 15\frac{1}{5} less than 1) and 712\frac{7}{12} is just a little over 12\frac{1}{2} (or is 112\frac{1}{12} more than 612\frac{6 }{12}, which is 12\frac{1}{2}). But I don’t know how far it is all the way around the lake or the pond. If the pond Tyler is walking around has a much longer distance than the lake Clare is walking around, then Tyler could be walking farther.

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Sample Response

Sample response: I know that 45\frac{4}{5} is greater than 712\frac{7}{12} because 45\frac{4}{5} is close to 1 (or is 15\frac{1}{5} less than 1) and 712\frac{7}{12} is just a little over 12\frac{1}{2} (or is 112\frac{1}{12} more than 612\frac{6 }{12}, which is 12\frac{1}{2}). But I don’t know how far it is all the way around the lake or the pond. If the pond Tyler is walking around has a much longer distance than the lake Clare is walking around, then Tyler could be walking farther.