章节大纲

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  • 比较整数

    Integers Review
    ::整整数审查

    Negative numbers are used throughout our modern society .  Some examples of negative numbers from the  lesson are elevation, temperature, and changes in the stock market.
    ::我们现代社会都使用负数,从这一教训中得出负数的例子有高温、温度和股市变化。

    Use the interactive below to see how moving the football above or below the line of scrimmage affects whether the integer is positive or negative.
    ::使用下方的交互功能来查看足球在球线上或下方的移动如何影响整数是正数还是负数。

     

    INTERACTIVE
    Net Yardage
    minimize icon

    The line of scrimmage is where the football starts. The net yardage is how many yards the ball ends up past the line of scrimmage. There is only enough time on the clock to run two more plays.
    ::球场线是足球的起点。 网场线是球场的几码处, 球场最后越过了球场线。 时间上只有足够的时间再打两场球。

    • Drag the red points to adjust the line of scrimmage and the position of the football.
      ::拖曳红色点以调整纵横线和足球位置。
    • Press the button to run the play
      ::按按钮播放播放
    • Then move the ball to another position and press the button to run the second play
      ::然后将球移动到另一个位置, 按此按钮来运行第二个播放
    • The last button will let you run two new plays
      ::最后一个按钮将允许您运行两个新的播放播放
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    Progress
    0 / 2
    1.

    Which of the following are plays to get a net yardage of 0 yards?
    ::下一部剧中哪部剧是为了得到一个零码的网形院子?

    Select all that apply
    a

    First play: 23 yards, Second play: -23 yards
    ::第一场: 23码,第二场: -23码

    b

    First play: 0 yards, Second play: 0 yards
    ::第一场:0码,第二场:0码

    c

    First play: -23 yards, Second play: -23 yards
    ::第一场: -23码,第二场: -23码

    d

    First play: -44 yards, Second play: 56 yards
    ::第一场: -44码,第二场: 56码

     

     

    Sea Level
    ::海平面海平面

    To compare positive numbers ,   check each  place value from left to right until you identify a greater value.
    ::要比较正数,请检查从左到右的每个位置值,直到您发现更大的值。

    Example
    ::示例示例示例示例

    Compare the numbers 517 and 520.
    ::与517和520号数字相比。

    To compare 517 and 520, start with the hundreds place. Both numbers have a 5 so move to the tens place. Since 2 is greater than 1, 520 is greater than 517.
    ::比较 517 和 520, 从百个地方开始 。 两个数字都有一个 5 个, 因此可以移动到 10 个。 因为 2 个大于 1 个, 520 个大于 517 个。

    5 1 _ 7 < 5 2 _ 0

     

    This process becomes more difficult when comparing negative numbers.  Consider the context of elevation. Sea level refers to the average water level of the Earth’s oceans.  A  location above  sea level has a positive elevation.  A location below  sea level  has a negative elevation.
    ::在比较负数时,这一过程变得更加困难。 考虑海平面的背景。 海平面是指地球海洋的平均水位。 海平面以上的地点具有正高度。 海平面以下的地点具有负高度。

    In this interactive, practice comparing positive and negative elevations on a number line .
    ::在这一互动关系中,对数字线上的正高和负高进行比较的做法。

     

    INTERACTIVE
    Sea Level
    minimize icon

    Label the elevation of each city on the number line.
    ::在数字线上标出每个城市的高度

    • Click on a section of the number line to zoom in.
      ::点击要缩放的数字行的一节 。
    • Once zoomed in, click on the number line again to select a range. 
      ::缩放后, 单击数字行再次选择一个区域 。
    • Choose the label of the city you want to label at that elevation.
      ::选择要在该高地标签的城市的标签 。
    • Click "Submit" to check your answer. 
      ::点击“ 提交” 检查您的回答 。
    • Click "Zoom out" to go back to the original view.
      ::单击“ 缩小” 返回原始视图 。
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    Borrowing Money
    ::借款

    Debt is an important instance of negative numbers that  affects our economy. Debt happens when a person or organization lets another borrow money.
    ::债务是影响我们经济的负数字的重要实例,当个人或组织借钱时,债务就会发生。

    The statement -$1,500 shows that someone owes 1,500 dollars.
    ::报表 - 1500美元显示 有人欠了1500美元

    The following interactive demonstrates how positive and negative integers can be used to determine how much money someone has and how much money someone owes.
    ::以下互动说明如何利用正数和负数整数来确定一个人有多少钱和欠了多少钱。

     

    INTERACTIVE
    IOU pt 2
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    • Drag the rectangles to order the people by how much money they have.
      ::拖动矩形以命令人民用他们有多少钱。
    • Order by people who have the most at the top to people who owe the most at the bottom.
      ::由最上层最上层 最下层欠下层最上层的人组成的秩序
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    Integer Puzzles
    ::整数谜题

    In the interactive below, practice comparing integers by completing a puzzle game.
    ::在下文互动中,练习通过完成拼图游戏来比较整数。

     

    INTERACTIVE
    Sudoku Comparison Puzzle
    minimize icon
    • Drag the tiles into correct spots to complete the comparison grid
      ::将瓷砖拖拖到正确位置以完成比较网格
    • Click "Check" to see which tiles are incorrectly placed
      ::点击“ 检查” 以查看哪些牌被错误安放
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     Summary
    ::摘要

    • For  positive numbers, the greater number is the number that is  farthest   from 0.
      ::就正数而言,数字越多,数字就越远。
    • For negative numbers, the greater number is the number that is closest to 0.
      ::负数数字越多,数字就越接近于0。
    • All positive numbers are greater than negative numbers.
      ::所有正数均大于负数。