3.3 分数对分数的影响-interactive

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  与分数相区别的效果

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  How much cookie dough ice cream does everyone eat?
  ::每个人都吃多少饼干面团冰淇淋?

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  Three friends order 2 large scoops of cookie dough ice cream at a scoop shop. A large scoop weighs  $\begin{align*}\tfrac{1}{2} \textrm{lbs}.\end{align*}$   Figure out  how much ice cream will each person get if the friends share the ice cream equally. 
  ::3个朋友在一家独家店点了2勺饼干面团冰淇淋。一勺大勺重12磅。看看如果朋友平等分享冰淇淋,每人能得到多少冰淇淋。

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  In this interactive, divide different amounts of ice cream evenly among friends. Later in this section you will calculate the value, or quotient , of different fractions.
  ::在此互动中, 在朋友之间平均分配不同数量的冰淇淋。 稍后在本节中, 您将计算不同分数的值或商数 。

   

   

   

   

   

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  Does "divide by half" mean divide by 2?
  ::"半分"的意思是除以2吗?

  

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  Sometimes people say "divide by half"  to  mean dividing something by 2. Use the interactive to see if the quotients of dividing by $\begin{align*}\tfrac{1}{2}\end{align*}$  are equivalent to the quotients of .  Input all the quotients you can and then reveal the rest to see the effects of dividing with the two values.
  ::有时人们会说“二分之一半”的意思是将某物除以 2. 使用互动来查看除以 12 的商数是否等于 12 的商数。输入所有你能够输入的商数,然后披露其余的,以看到与这两个值分开的效果。

   

   

   

   

   

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  What does the Jurassic era timeline look like?
  ::侏罗纪时代的时钟是什么样子?

  

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  The Jurassic era is known as the golden age of dinosaurs. This period stretched from 252 million years ago to 66 million years ago. Divide the Jurassic era in the timeline below using large numbers. Consider  the effects of dividing  with large values.
  ::侏罗纪时代被称为恐龙的黄金时代。 这一时期从2.52亿年前的25,200万年前延伸到6,600万年前。 将侏罗纪时代分为低于以大量数字计算的时段。 想想与巨大价值分化的效果。

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  In the following interactive, divide the timeline into segments of different lengths of time. The total number of segments represents the quotient between the length of the timeline and the length of each segment.
  ::在接下来的互动中,将时间段分为不同时间段。部分的总数代表时间段长度和每个部分长度之间的商数。

   

   

   

   

   

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  What does an iguana's lifespan look like?
  ::蜥蜴的寿命长什么样?

  

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  Some iguanas live for only one year. Use the timeline in the interactive to divide the lifespan of an iguana using fractions of a year. As you divide one year into more segments, the quotient representing the length of each gets smaller. Consider the effects of dividing with values close to zero .
  ::有些蜥蜴只活一年。 使用互动中的时间框架使用一年的分数来分割蜥蜴的寿命。 当您将一年分成更多的区块时, 代表每只蜥蜴长度的商数会变小。 想想以接近零的值进行分解的效果 。

   

   

   

   

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     Summary
  ::摘要

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  • Saying "divide in half" is the same as dividing by 2. 
    ::说"半成半成"等于除以2
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  • Saying "divide by   $\begin{align*}\frac12\end{align*}$ " is  NOT the same as dividing by 2.
    ::说"十二分十二分"和"二分二分"不一样