章节大纲

  • 常规

    全部折叠 展开全部

  • 建模 " 增加整数的建模 "

    Dancing Fool
    ::跳舞 愚舞

    Juan is at it again. He is making his dances more complicated and is not starting at zero . If Juan starts 2 steps away from zero, then moves 4 more steps to the right, where does he end up?
    ::胡安又来了。 他使舞蹈变得更复杂,而不是从零开始。 如果胡安从零开始两步,那么再往右移动四步,他最终会到哪里去呢?

    • Use the number line and move the feet to determine your answer.  
      ::使用数字线,移动脚来决定答案。
    • Use the number line to answer the additional challenge me questions.
      ::使用数字行回答额外的挑战问题。

     

     

     

     

     As you saw in this interactive, the answer for an addition problem can be positive or negative.  The answer can also be zero if the integers are opposites. When adding integers, start at the first integer on the number line. If the second integer is positive , move that many units to the right and where you land is the answer. If the second integer is negative , move that many units to the left and where you land is the answer. 
    ::正如您在此互动中看到的那样, 添加问题的答案可以是正或负。 如果整数是相反的, 答案也可以是零。 当添加整数时, 从数字行的第一个整数开始。 如果第二个整数是正, 则将许多单位移到右边, 并且您的位置是答案。 如果第二个整数是负的, 则将许多单位移到左边, 而您的位置是答案所在 。

    Discussion Question
    ::讨论问题

    Start at 0. Describe two dance steps that will bring you back to where you started. 
    ::开始于 0。 描述两个舞步, 让你回到开始的地方 。

     

    Board Game
    ::棋板游戏游戏游戏

     

     

     

     

    Question #4 is the commutative property of addition . For any two numbers, the order in which you add them does not matter;  a + b = b + a .  If you apply this to #5, the order in which you add the three numbers does not matter, so do the combination that is easiest for you. So, rather than do  9 + ( − 3 ) + 2 ,  you could do  9 + 2 + ( − 3 ) .  In this case, parenthes e s are used around the negative number to separate it from the plus sign, so they do not change this problem in any way.
    ::问题# 4 是添加的通量属性。 对于任何两个数字, 添加它们的顺序并不重要; a+b=b+a。 如果您将这个顺序应用到 # 5, 添加三个数字的顺序并不重要, 那么使用对您最容易的组合。 所以, 而不是使用 9+( 3) +2, 您可以使用 9+2+( 3) 。 在这种情况下, 括号围绕负数来将其与加号分开, 所以它们不会以任何方式改变这个问题 。

     

    Football
    ::足球足球

     

     

       Summary
    ::摘要

    • When adding integers, start at the first integer (on the number line) and move to the right or left, depending on the sign of the second integer to find the answer.
      ::添加整数时,从第一个整数开始(在数字行上),然后向右或向左移动,取决于第二个整数的符号以找到答案。