{"id":1372,"date":"2017-12-20T06:32:39","date_gmt":"2017-12-20T06:32:39","guid":{"rendered":"http:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/?post_type=chapter&p=1372"},"modified":"2017-12-30T02:27:39","modified_gmt":"2017-12-30T02:27:39","slug":"problem-bank-6","status":"publish","type":"chapter","link":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/chapter\/problem-bank-6\/","title":{"raw":"Problem Bank","rendered":"Problem Bank"},"content":{"raw":"[latexpage]\r\n
\r\n

Problem 28<\/h3>\r\n

Express the shaded portion of each figure as both a fraction and as a decimal.\u00a0 Justify your answers.<\/p>\r\n

\"\"<\/p>\r\n\r\n<\/div>\r\n \r\n

\r\n

Problem 29<\/h3>\r\n

Which number is bigger:\u00a0$0.135$\u00a0or $0.14$?\u00a0 Justify your answer.<\/p>\r\n\r\n<\/div>\r\n \r\n

\r\n

Problem 30<\/h3>\r\n

Arrange the digits 1, 2, 3, and 4 in the boxes to create the smallest possible sum.\u00a0 Use each digit exactly once.\u00a0 Justify that your answer is as small as possible.<\/p>\r\n\\[\\frac \\square \\square + \\frac \\square \\square\\]\r\n\r\n<\/div>\r\n \r\n

\r\n

Problem 31<\/h3>\r\n

Arrange the digits 1, 2, 3, and 4 in the boxes to create the smallest possible (positive) difference.\u00a0 Use each digit exactly once. Justify that your answer is as small as possible.<\/p>\r\n\\[\\frac \\square \\square - \\frac \\square \\square \\]\r\n\r\n<\/div>\r\n \r\n

\r\n

Problem 32<\/h3>\r\n

Use the \u201cDots & Boxes\u201d model to show that $\\frac 1 9 = 0.\\bar 1$.\u00a0 Then use this fact to answer these questions and justify your answers.<\/p>\r\n\r\n

    \r\n \t
  1. What fraction is given by $0.\\bar 2$?<\/li>\r\n \t
  2. What fraction is given by $0.\\bar 5$?<\/li>\r\n \t
  3. What fraction is given by $0.\\bar 6$?<\/li>\r\n \t
  4. What fraction is given by $0.\\bar 8$?<\/li>\r\n \t
  5. What fraction is given by $0.\\bar 9$?<\/li>\r\n<\/ol>\r\n<\/div>\r\n \r\n
    \r\n

    Problem 33<\/h3>\r\n

    In this problem, you will focus on the calculation \\[170 \\times \\square.\\]<\/p>\r\n

    Your goal is to get a product that is close to 200.<\/p>\r\n\r\n

      \r\n \t
    1. Will you multiply 170 by a number greater or less than 1?\u00a0 Greater or less than 2?\u00a0 Justify your answers.<\/li>\r\n \t
    2. Suppose you can use only one decimal place.\u00a0 Fill in the box with a number that gets as close to 200 as possible.<\/li>\r\n \t
    3. Suppose you can use only two decimal places.\u00a0 Fill in the box with a number that gets as close to 200 as possible.<\/li>\r\n \t
    4. Suppose you can use only three decimal places.\u00a0 Fill in the box with a number that gets as close to 200 as possible.<\/li>\r\n<\/ol>\r\n<\/div>\r\n \r\n
      \r\n

      Problem 34<\/h3>\r\n

      Do each computation below without using a calculator.\u00a0 Explain your thinking.<\/p>\r\n\r\n

        \r\n \t
      1. $(23\\times 0.1) + (0.001 \\times 55)$.<\/li>\r\n \t
      2. $18.45 \\div (0.63 \\div 0.7)$.<\/li>\r\n \t
      3. $22.65 - (0.03 \\cdot 10)$.<\/li>\r\n<\/ol>\r\n<\/div>\r\n \r\n
        \r\n

        Problem 35<\/h3>\r\n

        Without actually calculating anything (just use your number sense!), order $x$, $y$, and\u00a0$z$\u00a0from smallest to largest.\u00a0 Explain your ordering.<\/p>\r\n\\[x = 0.07 + 0.000001\\]\r\n\r\n\\[ y = 0.07 \\times 0.000001\\]\r\n\r\n\\[ z = 0.07 \\div 0.000001\\]\r\n\r\n<\/div>\r\n \r\n

        \r\n

        Problem 36<\/h3>\r\n

        For each question below, choose the correct calculation and explain your choice.\u00a0 Then estimate the answer (don\u2019t calculate it exactly) and explain why your estimate is a good one.<\/p>\r\n\r\n

          \r\n \t
        1. A large pizza has eight slices and costs \\$15.95.\u00a0 How much does each slice of pizza cost? Should you calculate\u00a0$15.95 \\times 8$ or $15.95 \\div 8$?<\/li>\r\n \t
        2. There are 2.54 centimeters in an inch.\u00a0 A standard sheet of notebook paper is $8\\frac 1 2$ inches wide and 11 inches long.\u00a0 How many centimeters wide is the page? Should you calculate\u00a0$8.5 \\times 2.54$ or\u00a0$11 \\times 2.54$ or\u00a0$8.5 \\div 2.54$ or $11 \\div 2.54$?<\/li>\r\n \t
        3. In a model train set, 1.38 inches represents one foot in real life.\u00a0 The height of One World Trade Center in New York City is 1776 feet.\u00a0 How tall would a scale model of the building be? Should you calculate\u00a0$1776 \\times 1.38$ or $1776 \\div 1.38$?<\/li>\r\n \t
        4. Eight-tenths of a jumprope is 1.75 meters long.\u00a0 How long is the whole rope? Should you calculate\u00a0$0.8 \\times 1.75$ or\u00a0$0.8 \\div 1.75$ or $1.75 \\div 0.8$?<\/li>\r\n<\/ol>\r\n<\/div>\r\n \r\n
          \r\n

          Problem 37<\/h3>\r\n

          Kaimi had no money at all when he cashed his paycheck. As he left the bank, he bought a piece of candy for a nickel from a machine. Later, he realized that the money in his pocket was equal to twice his paycheck. After a quick calculation, he figured out what happened: the teller accidentally switched the dollars and cents. How much was Kaimi supposed to be paid, and what did the teller give him?\u00a0 Justify your answer.<\/p>\r\n\r\n<\/div>\r\n \r\n

          \r\n

          Problem 38<\/h3>\r\n

          Here are the rules to a card game. Read the rules carefully and then answer the questions below.<\/p>\r\n\r\n

            \r\n \t
          • Each player starts with 10 points. The goal is to score as close to 100 points as possible without going over.<\/li>\r\n<\/ul>\r\n
              \r\n \t
            • On your turn: draw two cards, which will each have a decimal number on them. Using estimation (no computation), you can choose to multiply or divide your current score by one of the decimal numbers.<\/li>\r\n<\/ul>\r\n
                \r\n \t
              • After you decide, compute your new score exactly using a calculator. If your new score is over 100, you lose. If not, the other player takes a turn.<\/li>\r\n<\/ul>\r\n
                  \r\n \t
                • At the end of your turn, you can decide to end the game. If you do, the other player gets one more turn. Then, the player with the score that is closest to 100 without going over wins the game.<\/li>\r\n<\/ul>\r\n

                  Here are the questions:<\/p>\r\n\r\n

                    \r\n \t
                  1. On your turn, your score is 50.\u00a0 You draw the cards\u00a0$0.2$\u00a0and $1.75$.\u00a0 Remember that your choices are:\u00a0 \\[\\text{divide by } \\ 0.2 \\qquad\\qquad \\text{multiply by } \\ 0.2\\] \\[ \\text{divide by } \\ 1.75 \\qquad\\qquad \\text{multiply by } \\ 1.75.\\]\u00a0What is your best move and why?<\/li>\r\n \t
                  2. On your turn, your score is 88.\u00a0 You draw\u00a0$1.3$\u00a0and $0.6$.\u00a0 What is your best move and why?<\/li>\r\n \t
                  3. Your partner has a score of 57, and your score is 89.\u00a0 On her turn, your partner draws\u00a0$0.8$\u00a0and $1.8$.\u00a0 She says she wants to end the game.\u00a0 On your final turn, you draw\u00a0$0.7$\u00a0and $1.2$.\u00a0If you both make the best possible move, who will win the game?\u00a0 Justify your answer.<\/li>\r\n<\/ol>\r\n<\/div>","rendered":"
                    \n

                    Problem 28<\/h3>\n

                    Express the shaded portion of each figure as both a fraction and as a decimal.\u00a0 Justify your answers.<\/p>\n

                    \"\"<\/p>\n<\/div>\n

                     <\/p>\n

                    \n

                    Problem 29<\/h3>\n

                    Which number is bigger:\u00a0\"0.135\"\u00a0or \"0.14\"?\u00a0 Justify your answer.<\/p>\n<\/div>\n

                     <\/p>\n

                    \n

                    Problem 30<\/h3>\n

                    Arrange the digits 1, 2, 3, and 4 in the boxes to create the smallest possible sum.\u00a0 Use each digit exactly once.\u00a0 Justify that your answer is as small as possible.<\/p>\n

                      <\/span>   <\/span>\"\[\frac \square \square + \frac \square \square\]\"<\/p>\n<\/div>\n

                     <\/p>\n

                    \n

                    Problem 31<\/h3>\n

                    Arrange the digits 1, 2, 3, and 4 in the boxes to create the smallest possible (positive) difference.\u00a0 Use each digit exactly once. Justify that your answer is as small as possible.<\/p>\n

                      <\/span>   <\/span>\"\[\frac \square \square - \frac \square \square \]\"<\/p>\n<\/div>\n

                     <\/p>\n

                    \n

                    Problem 32<\/h3>\n

                    Use the \u201cDots & Boxes\u201d model to show that \"\frac 1 9 = 0.\bar 1\".\u00a0 Then use this fact to answer these questions and justify your answers.<\/p>\n

                      \n
                    1. What fraction is given by \"0.\bar 2\"?<\/li>\n
                    2. What fraction is given by \"0.\bar 5\"?<\/li>\n
                    3. What fraction is given by \"0.\bar 6\"?<\/li>\n
                    4. What fraction is given by \"0.\bar 8\"?<\/li>\n
                    5. What fraction is given by \"0.\bar 9\"?<\/li>\n<\/ol>\n<\/div>\n

                       <\/p>\n

                      \n

                      Problem 33<\/h3>\n

                      In this problem, you will focus on the calculation <\/p>\n

                        <\/span>   <\/span>\"\[170 \times \square.\]\"<\/p>\n

                      Your goal is to get a product that is close to 200.<\/p>\n

                        \n
                      1. Will you multiply 170 by a number greater or less than 1?\u00a0 Greater or less than 2?\u00a0 Justify your answers.<\/li>\n
                      2. Suppose you can use only one decimal place.\u00a0 Fill in the box with a number that gets as close to 200 as possible.<\/li>\n
                      3. Suppose you can use only two decimal places.\u00a0 Fill in the box with a number that gets as close to 200 as possible.<\/li>\n
                      4. Suppose you can use only three decimal places.\u00a0 Fill in the box with a number that gets as close to 200 as possible.<\/li>\n<\/ol>\n<\/div>\n

                         <\/p>\n

                        \n

                        Problem 34<\/h3>\n

                        Do each computation below without using a calculator.\u00a0 Explain your thinking.<\/p>\n

                          \n
                        1. \"(23\times 0.1) + (0.001 \times 55)\".<\/li>\n
                        2. \"18.45 \div (0.63 \div 0.7)\".<\/li>\n
                        3. \"22.65 - (0.03 \cdot 10)\".<\/li>\n<\/ol>\n<\/div>\n

                           <\/p>\n

                          \n

                          Problem 35<\/h3>\n

                          Without actually calculating anything (just use your number sense!), order \"x\", \"y\", and\u00a0\"z\"\u00a0from smallest to largest.\u00a0 Explain your ordering.<\/p>\n

                            <\/span>   <\/span>\"\[x = 0.07 + 0.000001\]\"<\/p>\n

                            <\/span>   <\/span>\"\[ y = 0.07 \times 0.000001\]\"<\/p>\n

                            <\/span>   <\/span>\"\[ z = 0.07 \div 0.000001\]\"<\/p>\n<\/div>\n

                           <\/p>\n

                          \n

                          Problem 36<\/h3>\n

                          For each question below, choose the correct calculation and explain your choice.\u00a0 Then estimate the answer (don\u2019t calculate it exactly) and explain why your estimate is a good one.<\/p>\n

                            \n
                          1. A large pizza has eight slices and costs $15.95.\u00a0 How much does each slice of pizza cost? Should you calculate\u00a0\"15.95 \times 8\" or \"15.95 \div 8\"?<\/li>\n
                          2. There are 2.54 centimeters in an inch.\u00a0 A standard sheet of notebook paper is \"8\frac 1 2\" inches wide and 11 inches long.\u00a0 How many centimeters wide is the page? Should you calculate\u00a0\"8.5 \times 2.54\" or\u00a0\"11 \times 2.54\" or\u00a0\"8.5 \div 2.54\" or \"11 \div 2.54\"?<\/li>\n
                          3. In a model train set, 1.38 inches represents one foot in real life.\u00a0 The height of One World Trade Center in New York City is 1776 feet.\u00a0 How tall would a scale model of the building be? Should you calculate\u00a0\"1776 \times 1.38\" or \"1776 \div 1.38\"?<\/li>\n
                          4. Eight-tenths of a jumprope is 1.75 meters long.\u00a0 How long is the whole rope? Should you calculate\u00a0\"0.8 \times 1.75\" or\u00a0\"0.8 \div 1.75\" or \"1.75 \div 0.8\"?<\/li>\n<\/ol>\n<\/div>\n

                             <\/p>\n

                            \n

                            Problem 37<\/h3>\n

                            Kaimi had no money at all when he cashed his paycheck. As he left the bank, he bought a piece of candy for a nickel from a machine. Later, he realized that the money in his pocket was equal to twice his paycheck. After a quick calculation, he figured out what happened: the teller accidentally switched the dollars and cents. How much was Kaimi supposed to be paid, and what did the teller give him?\u00a0 Justify your answer.<\/p>\n<\/div>\n

                             <\/p>\n

                            \n

                            Problem 38<\/h3>\n

                            Here are the rules to a card game. Read the rules carefully and then answer the questions below.<\/p>\n

                              \n
                            • Each player starts with 10 points. The goal is to score as close to 100 points as possible without going over.<\/li>\n<\/ul>\n
                                \n
                              • On your turn: draw two cards, which will each have a decimal number on them. Using estimation (no computation), you can choose to multiply or divide your current score by one of the decimal numbers.<\/li>\n<\/ul>\n
                                  \n
                                • After you decide, compute your new score exactly using a calculator. If your new score is over 100, you lose. If not, the other player takes a turn.<\/li>\n<\/ul>\n
                                    \n
                                  • At the end of your turn, you can decide to end the game. If you do, the other player gets one more turn. Then, the player with the score that is closest to 100 without going over wins the game.<\/li>\n<\/ul>\n

                                    Here are the questions:<\/p>\n

                                      \n
                                    1. On your turn, your score is 50.\u00a0 You draw the cards\u00a0\"0.2\"\u00a0and \"1.75\".\u00a0 Remember that your choices are:\u00a0\n

                                        <\/span>   <\/span>\"\[\text{divide by } \ 0.2 \qquad\qquad \text{multiply by } \ 0.2\]\"<\/p>\n

                                        <\/span>   <\/span>\"\[ \text{divide by } \ 1.75 \qquad\qquad \text{multiply by } \ 1.75.\]\"<\/p>\n

                                      \u00a0What is your best move and why?<\/li>\n

                                    2. On your turn, your score is 88.\u00a0 You draw\u00a0\"1.3\"\u00a0and \"0.6\".\u00a0 What is your best move and why?<\/li>\n
                                    3. Your partner has a score of 57, and your score is 89.\u00a0 On her turn, your partner draws\u00a0\"0.8\"\u00a0and \"1.8\".\u00a0 She says she wants to end the game.\u00a0 On your final turn, you draw\u00a0\"0.7\"\u00a0and \"1.2\".\u00a0If you both make the best possible move, who will win the game?\u00a0 Justify your answer.<\/li>\n<\/ol>\n<\/div>\n","protected":false},"author":21,"menu_order":10,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1372","chapter","type-chapter","status-publish","hentry"],"part":1068,"_links":{"self":[{"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/pressbooks\/v2\/chapters\/1372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/wp\/v2\/users\/21"}],"version-history":[{"count":15,"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/pressbooks\/v2\/chapters\/1372\/revisions"}],"predecessor-version":[{"id":2485,"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/pressbooks\/v2\/chapters\/1372\/revisions\/2485"}],"part":[{"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/pressbooks\/v2\/parts\/1068"}],"metadata":[{"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/pressbooks\/v2\/chapters\/1372\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/wp\/v2\/media?parent=1372"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/pressbooks\/v2\/chapter-type?post=1372"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/wp\/v2\/contributor?post=1372"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks-dev.oer.hawaii.edu\/math111\/wp-json\/wp\/v2\/license?post=1372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}