章节大纲

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  • 按分数划分整数

    How many tablespoons of milk for a hot chocolate?
    ::热巧克力要喝多少汤匙牛奶?

    Image showing a mug with hot chocolate inside

    Christine likes to make her hot chocolate with milk. Her recipe calls for  1 2  cup of milk but Christine only has a tablespoon on hand. Her brother tells her that each tablespoon is  1 16  of a cup.
    ::克里斯蒂娜喜欢用牛奶做热巧克力。她的食谱需要12杯牛奶,但克里斯蒂娜只手里有一块桌球。她哥哥告诉她,每块桌球是116个杯子。

    In this interactive, find how many tablespoons Christine needs by dividing by a fraction or by multiplying by that fraction’s reciprocal .
    ::在此互动中,通过除以一个分数或乘以该分数的对等值来发现克里斯蒂娜需要多少个表层。

     

     

     

     

    How many bowls of freshly popped popcorn can you make?
    ::你能做多少碗新鲜爆米花?

    lesson content

    Homemade popcorn is  delicious and very healthy. All you have to do is pour a little oil into a pot on the stove with some popcorn kernels.  Give  the pot a shake once in awhile after you start to hear the kernels popping. Add a little salt and enjoy your freshly popped popcorn!
    ::土制爆米花是美味的,非常健康。你要做的就是用爆米花的内核把一点油倒进炉子里的锅里。 在你开始听到内核爆出声后,偶尔给罐子一个抖动。 加点盐,享受你刚刚爆出的爆米花!

    Ingredients:
    ::成份 :

    1 tablespoon olive oil
    ::1台桌面橄榄油

    1 4  cup popcorn kernels
    ::14杯爆米花内核

    Use the interactive to find how many bowls of popcorn you can make by dividing the whole number of cups by a fraction. Visualize why multiplying by that fraction’s reciprocal gives you the same value.
    ::使用互动来查找您通过将杯子总数除以一个分数就能制造多少碗爆米花。 想象一下为什么乘以该分数的对等值就给了您相同的价值。

     

     

     

     

     

    Can you fill the health bars in a video game?
    ::你能在视频游戏里填充健康栏杆吗?

    lesson content
    League of Lions

    In a video game, League   of L ion s , the health bars show across the top of the screen. Every time a player restores their health with a spell, a fraction of the health is returned to the health bar.
    ::在电视游戏中,狮子联盟,健康栏杆显示在屏幕的顶部。每次玩家用咒语恢复健康,一小部分健康就会回到健康栏上。

    In the next interactive, multiply by the fraction’s reciprocal to divide by a fraction and find how many spells it takes to fill your health bar.
    ::在接下来的互动中,乘以该分数的对等分数,再除以一个分数,然后找出填充你的健康棒需要多少咒语。

     

     

     

     

     

    Discussion Questions
    ::讨论问题 讨论问题

    1. Why do you use a 1 in the denominator of the whole number?
      ::为什么整个数字的分母中 使用一分之一?
    2. Why did you divide 6 by 2 in the last step?
      ::为什么最后一步你把六比二分开?
    3. Why is dividing by a fraction, the same as multiplying by the recipr ocal of the fraction?
      ::为什么除以一个分数, 和以分数的对等乘法相同?

     

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

    lesson content

    The Jurassic era is known as the golden age of dinosaurs.  This period stretched from 252 million years ago to 66 million years ago. 
    ::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2.52亿年延伸到6 600万年前。

    Use this interactive to divide the Jurassic era into segments of fractional length and divide by that fraction to find how many segments you have created. Remember that multiplying by the fraction’s reciprocal can be used to evaluate the number of segments.
    ::使用此互动来将 Jurassic 时代分割成分数长度的区段, 并用该区段分隔以查找您创建的区段 。 记住, 乘以该区段对等的乘法可以用来评估区段数量 。

     

     

     

      Summary
    • A unit fraction is in the form of 1 divided by a number.
      ::单位分数以 1 除以一个数字的形式出现。
    • When dividing a number by a fraction, flip the second fraction and multiply. For example:  2 ÷ 1 3 → 2 × 3  
      ::当将数字除以分数时, 翻转第二个分数和乘数。 例如 : 2\\ 13\ 2x3