章节大纲

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  • 以整数表示的分数

    Sharing Scratch-n-Sniff Stickers

    ::共享 Scratch-n- Sniff 粘贴器

    In this interactive, you want to share your stickers evenly among your friends. Divide the number of stickers by the number of your friends to have. Later in this lesson you will by whole numbers as well.
    ::在此互动中, 您想要在朋友之间平均分享您的贴纸 。 将标签数除以您朋友的数量 。 在此课中, 稍后您也会用整数来分享 。

     

    Progress
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    1.

    Choose the TRUE statements about the above interactive.
    ::选择关于上述互动的 TRUE 语句。

    Select all that apply
    a

    To be fair, Jeremy wants to give All four friends the same number of whole stickers. This will leave Jeremy with left over stickers.
    ::公平地说 Jeremy想给所有四个朋友 同样的贴纸

    b

    Jerrick, Greg, Erica and Manny will all get 3 whole stickers
    ::Jerrick、Greg、Erica和Manny 都会得到三张整张贴纸

    c

    Jerrick will get only 2 whole stickers, while Erica gets 5 and Manny and Greg both get 3. This is a total of 13 stickers.
    ::Jerrick只得到两个整张贴纸 而Erica只得到5张 Manny和Greg都得到3张 这总共是13张贴纸

    d

    Since all four friends will get the same number of whole stickers, Jeremy will be left with left over stickers.
    ::由于所有四个朋友都会得到相同数量的整张贴纸 Jeremy将留下剩下的贴纸

    e

    After giving out as many whole stickers to his friends, Jeremy has 2 whole stickers left.
    ::Jeremy给朋友贴了那么多贴纸后 还剩下两个整张贴纸

    f

    If Jeremy divides his left over sticker into @$\begin{align*}4\end{align*}@$   equal parts and gives one part to each friend, each friend will get @$\begin{align*}\tfrac{1}{4}\end{align*}@$ sticker.
    ::如果Jeremy将左侧的贴纸分割为@$\ begin{ align}4\ end{ align}$ 等分, 给每个朋友一个部分, 每个朋友都会得到@$\ begin{ align} tfrac{ 1\ @ @ @ @ 4 @ end{ align}$ accostaper 。

     

     

    Can   you design a flag?
    ::你能设计旗子吗?

    lesson content
    American Flags

    Flags usually use consistent measurements. Well-designed flags are simple in appearance so that children can draw them from memory. Use the interactive below to design your own flags. After, you will answer questions based on your designs.
    ::旗帜通常使用一致的测量。 设计良好的旗帜在外观上很简单, 以便让孩子们能够从记忆中画出这些旗帜。 使用下面的交互效果来设计自己的旗帜 。 之后, 您将根据设计来回答问题 。

     

    INTERACTIVE
    Design a Flag
    minimize icon
    • Drag the red points to make each of the stripes on the flag the same width.
      ::拖曳红色点,使旗帜上每个条纹的宽度相同。
    • Click the stripes to change their colors.
      ::单击条纹以改变颜色 。
    • Press the white button to switch between a flag with 6 stripes and 3 stripes.

      ::按下白色按钮,在有6条和3条的旗帜之间切换。
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    How  do you share a milkshake evenly among friends?
    ::朋友之间如何平等分享奶昔?

    Oskar made one large milkshake to share with his friends by mixing vanilla ice cream and milk together in a blender.
    ::奥斯卡做了一个大奶昔 和他的朋友分享 通过混合香草冰淇淋和牛奶 在搅拌机。

    In the following interactive, divide the mixed number (representing the amount of Oskar’s milkshake) by a whole number of glasses.
    ::在接下来的互动中,将混合数字(代表奥斯卡奶昔的数量)除以整副杯子。

    INTERACTIVE
    Sharing a Milkshake
    minimize icon
    • Enter the amount of milkshake Oskar should pour for each of his friends depending on how much he has in total and how many glasses he has.
      ::输入为每个朋友倒奶昔奥斯卡的奶昔数量, 取决于他总共有多少杯子和多少杯子。
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    How many days to volunteer at the animal shelter?
    ::多少天去动物收容所当志愿者?

    An Irish Wolfhound wearing a t-shirt with the CK-12 logo on it.

    Anita and her dad volunteer at the local animal shelter together for an hour and a half each week. Anita logs her volunteer hours so she can qualify for an award at her school. How many days does Anita need to volunteer to receive the award?
    ::安妮塔每周在本地动物收容所共事一个半小时。 安妮塔在自愿时间里工作,以便她能够在学校获得奖项。 安妮塔需要多少天才能自愿获得奖项?

    Use this interactive to divide the mixed number of total hours by a whole number of days to see that Anita volunteers for 1½ hours each day.
    ::使用此互动方式将总时数的混合数除以整日数, 以看到安妮塔的志愿者每天工作1个半小时。

     

     

    INTERACTIVE
    Volunteering at the Animal Shelter
    minimize icon

    Anita and her dad volunteer for  @$1\frac{1}{2}@$  hours in a day. 
    ::@1\frac{1\%2>$$$ hours in day.

    • Enter the number of days Anita needs to volunteer to receive the award in the white box according to the number of total hours she needs in red.
      ::输入 Anita 需要自愿在白箱里领奖的天数, 取决于她需要红色的时数 。
    • There are three problems to try.
      ::有三个问题需要尝试。
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       Summary
    ::摘要

    • You can divid e a fraction by a whole number  rewriting the fraction as a sum of smaller equal fractions.
      ::您可以将一个分数除以整数重写该分数,以小数相等分数的总和表示。
    • If the divisor  go evenly  into the numerator, you only have to divide the numerator by the divisor to find the numerator of the quotient. The denominator will stay the same. 
      ::如果差数均匀进入分子中,只需用差数将分子除以,才能找到商数的分子。分母将保持不变。

    For  12 5 ÷ 4  
    ::125=4

    The numerator, 12 ,  can be evenly divided by the divisor,  4 ,  to get  3.  The denominator will stay the same:  
    ::分子,12,可以平均地除以 4,3。 分母会保持原样:

    12 5 ÷ 4 = 3 5