Section outline

  • How many minutes do you spend dreaming per night?
    ::你每晚做梦要花多少分钟?

    lesson content

    During REM sleep you have vivid dreams and your eyes dart back and forth under your eyelids as if you are watching events in your dreams.
    ::在REM睡觉期间,你有着生动的梦想,你的双眼在你的眼皮下回转转转,仿佛你在看梦中的事件。

    Kids need between 540 and 660 minutes of sleep in a night. Kids spend about 20% of their sleep time in REM. Infants need between 660 and 840 minutes of sleep in a night and they spend about 50% of their sleep time in REM.  In this lesson, you will solve more problems with percentages using double number lines.

    ::孩子们每晚需要540至660分钟的睡眠。孩子们大约20%的睡眠时间在REM中度过。婴儿每晚需要660至840分钟的睡眠,每晚大约50%的睡眠时间在REM中度过。在这个课程中,你将用双倍的行数来解决更多问题。

    Use the interactive below to calculate the amount of time a child and infant spends their sleep time in REM using a double tape diagram. Throughout the lesson, you will solve more problems with percentages using double number lines.
    ::使用下面的交互数据来计算孩子和婴儿在REM的睡眠时间,使用双磁带图。在整个课程中,您会用双倍数字线解决更多问题。

    INTERACTIVE
    REM Sleep
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    • The numbers atop the tape diagrams represent minutes asleep.
      ::磁带图上的数字代表睡着了几分钟
    • Type in the number equal to 10% of the total number minutes asleep.
      ::等于睡觉时总分钟数的10%。
    • The purple cells represent minutes in REM sleep.
      ::紫色牢房代表REM睡眠中的分钟。
    • Slide the red dots to change the percentage of time.
      ::滑动红色点以改变时间的百分比 。
    • Reset the interactive to see new numbers for total minutes asleep.
      ::重置交互程序, 以看到新数字, 总共几分钟的睡着时间 。
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    How much  money does it take to bake cookies?
    ::烤饼干要花多少钱?

    A pan full of chocolate chip cookies

    Freddie  sells cookies to his neighbors each week to make some extra money . He buys  ingredients for the cookies based on the amount of money he was able to make the week before. 
    ::弗雷迪每周向邻居出售饼干以赚取一些额外的钱。他根据一周前赚到的钱购买饼干的原料。

    Use the double number line in the interactive below to find the amount that Freddie spends on ingredients if he spends a given percent of his budget on food.
    ::使用下方互动的双倍数字线, 找出弗雷迪在食物上花费一定比例预算时 花在原料上的数额。

    INTERACTIVE
    How much $ does it take to bake cookies?
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    Freddie sells cookies to his neighbors each week to make some extra money.  He buys ingredients for the cookies based on the amount of money he was able to make the week before. 
    ::弗雷迪每周向邻居出售饼干以赚取一些额外的钱。他根据一周前赚到的钱购买饼干的原料。

    • Find the given percentage of Freddie's earnings.
      ::找到弗雷迪收入的一定百分比
    • Type your answer in the purple box.
      ::输入您在紫色盒子中的答案 。
    • Use the boxes for the other percentages to help you find the correct answer.
      ::使用其他百分比的框来帮助您找到正确的答案 。
    • When you find the correct answer, start a new problem with the "Try Another" button. 
      ::当您找到正确的答案时, 以“ 尝试另一个” 按钮启动新问题 。
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    Discussion Questions
    ::讨论问题 讨论问题

    1. What does 100% represent in the double number line?
      ::100%在双数行中代表什么?
    2. Did you find the dollar amounts for other percentages to help you figure out the amount Freddie will spend on ingredients? What other percentages did you find to be most useful in this process?
      ::你找到其他百分比的美元数额来帮助你弄清楚弗雷迪在原料上花费的金额吗?你发现在这个过程中还有什么其他百分比最有用?
    3. If Freddie wanted to spend 90% of his earnings on ingredients, why would it be useful to determine the value of 10% of his spending?
      ::如果弗雷迪想把收入的90%花在原料上,

    How many horses are there compared to other pets?
    ::与其他宠物相比,有多少匹马?

    lesson content
    Pet horse

    In 2018 in the US, people had 8 million pet horses. In the interactive below, fill out the part of the double number line to find how many other pets people had of each species.
    ::2018年,美国有800万匹宠物马。 在下文互动中,填上双倍数线的部分以寻找每个物种中有多少其他宠物。

    INTERACTIVE
    How many horses are there compared to other pets?
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    In 2018 in the US, people had 8 million pet horses. 
    ::2018年,美国有800万匹宠物马

    • Use the percentages in the double number line to find how many  other pets people had of each species.
      ::使用双倍数线中的百分比来寻找每个物种中有多少其他宠物。
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    How much do the heaviest animals weigh?
    ::最重的动物体重多少?

    lesson content
    African Elephant

    The heaviest land mammals on Earth are elephants, rhinos, giraffes and hippos. Fill out the double number line in the interactive below to find the heaviest weight of each of the most heavy land mammals on Earth.
    ::地球上最重的陆地哺乳动物是大象、犀牛、长颈鹿和河马。填写下面互动中的双倍数线,以找到地球上每个最重陆地哺乳动物最重的重量。

    INTERACTIVE
    Heaviest Animals
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    Compare the weights of heavy animals using a number line! The top number line shows the weight of the animals in pounds, while the bottom shows the percentage of weight between the two animals. 
    ::使用数字线比较重动物的重量! 最高数字线显示动物的重量( 磅) , 底部显示两个动物之间的重量百分比 。

    • Enter your answers in the input boxes
      ::在输入框中输入答案
    • The blue text corresponds to the first animal and the red text corresponds to the second animal.
      ::蓝色文字对应于第一种动物,红色文字对应于第二种动物。
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    CK-12 PLIX Interactive: Play Checkers
    ::CK-12 PLIX 互动: 游戏跳棋

    Use the PLIX Interactive to use the game of checkers to explore different percents.
    ::使用 PLIX 互动来使用棋盘游戏来探索不同百分比 。

     

       Summary
    ::摘要

    • Use smaller percents such as 1%, 5%, 10%, and 25% to help find other percents that are not as easy to calculate. 
      ::使用1%、5%、10%和25%等较小百分比来帮助找到其他不易计算的百分比。