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Teaching Math Provides Students with
Authentic Exposure and Context for
Chinese Language Learning in DL Class.

               Joanne Wang
        5th Grade DL Teacher from PS173Q
                November 30, 2012
Language Function
          • Sentence Structure
          • Vocabulary (Content &
            Academic )                       Content & Concept


Collaboration                                              Strategies
                                                 •   Read aloud & Shared-Reading
                                                 •   Preview Academic Vocabulary
                   How to Design                 •   Sentence re/deconstruction
                                                 •   Visuals
                 LPs for Math in 5th
                                                 •   Flexible Groupings
                 Grade DL Class?
                                                 •   Have Students Create
                                                     Problems and Trade with
                                                     Others for Solutions.
                                                 •   Sentence Prompts for
                                                     Speaking and Writing
     Literacy                                    •   Have Students Ask & Answer
                                                     Questions.
                      CCLS for Mathematics
                                                 •   Bulletin Board for Reference
                                                 •   Modeling & Repetition
6.3 Number Sense: Decimal Multiplication


         CCLS for Math                  Mathematical Practices
5.NBT.7 - Add, subtract, multiply,      Reason abstractly and
and divide decimals to hundredths,       quantitatively.
using concrete models or drawings       Construct viable arguments
and strategies based on place            and critique the reasoning
value, properties of operations,         of others.
and/or the relationship between         Look for and make use of
addition and subtraction; relate the     structure.
strategy to a written method and
explain the reasoning used.
TP:   我们用数感做小数乘法
          。
 We use number sense for decimal multiplication.
上一课你学到了什么知识?
如何估算一个整数乘以一个小数的乘积。
举例:用四舍五入法
   16 x 2.15

   20 x 2     20x2=40
用兼容数:
  16 x 2.15

   15 x 2     15x2=30
今天我们根据被乘数、乘数的大小、关系来 推
论 乘积的大小 , 小数 点的位置 ( 小数点应该在
哪里? )

        10 x 0.9 = Y
请问 : Y>10 ? 或者 Y<10? 为什
 么?
与同伴分享你的推论或解释,请用句型:
         因为…所以…
生词
数感 :人们对数及它们之间的关系的
认识,和解决实际问题的能力。

 比如: 10x0.9 的乘积一定小于 10 。
    因为 10x1=10 ,而 0.9<1 ,
      所以 10x0.9<10


 10x0.9=9    <   10x1=10
思考
:    被乘数、乘数和乘积的关系
如果一个乘数是一个小数( 0.55 ),那么无论被
 乘
数是一个什么数,它们的乘积一定小于被乘数。
       65.30x0.55= ?
因为乘数 0.55<1 ,所以乘积一定会小于 65.30
       65.30x0.55=3592

            小数点应该在哪里?
因为 0.55 接近一半,而 65.30 的一半大约是
 35 ,所
用我们的数感来找出被乘数或乘
       数
被乘数是一个什么样的小数才能使下面的乘法
等式成立?
  _______ x 5.1 的乘积大约是 30 。

思考:
       因为 6 乘以 5 等于 30 ,所以被乘
 数应
       该是一个接近 6 的小数。比如:
 6.1
       6.1x5.1 的乘积大约是 30 。
用数感推论下列乘积中小数点的位置
1.) 5 x 3.4 = 17
2.) 3.1 x 6.2 = 1922

3.) 0.6 x 0.4 = 24

从 3 题中选出一题,写出推论过程
请用:因为…所以…
和同伴分享你是如何推论的。
用数感推论下列乘积中小数点的位置是正确的,还
是错误的?为什么?如果是错的,请给出正确答案
,并且解释。

1.)  7.8 x 0.3 = 23.4
 2.) 12 x 4.8 = 57.6

 3.) 0.6 x 0.7 = 0.042

7.8 x 0.3 = 23.4 是 ______ 的,因为
   _____, 而 _______, 所以
   ________ 。
请一边观看一边思考,并且用
   你的数感回答问题

https://www.pearsonsuccessnet.com/snpapp/login/login.jsp
Differentiated Independent Work
姓名:__________                        日期:________

下列 1 和 2 乘法题中的乘积缺少小数点,请你用数感把小数点填写
到正确的位置。然后请解释为什么。

     因为…, 而…, 所以…。/           因为…,所以…。

1. 5.01 x 3 = 1503
_____________________________________________
_____________________________________________

2. 1.8 x 1.9 = 342
_____________________________________________
_____________________________________________



3. 请判断乘积的小数点位置是否正确。如果不正确,请
给出正确答案,并且解释为什么。请用:因为…, 而…, 所
以…。/   因为…,所以…。

                1.1 x 13.8 = 1.518
_____________________________________________
_____________________________________________
Partner Work
数学板报

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Joanne Wang: Teaching Math Provides Students with Authentic Exposure and COntext for CHinese Language Learning in DL Class

  • 1. Teaching Math Provides Students with Authentic Exposure and Context for Chinese Language Learning in DL Class. Joanne Wang 5th Grade DL Teacher from PS173Q November 30, 2012
  • 2. Language Function • Sentence Structure • Vocabulary (Content & Academic ) Content & Concept Collaboration Strategies • Read aloud & Shared-Reading • Preview Academic Vocabulary How to Design • Sentence re/deconstruction • Visuals LPs for Math in 5th • Flexible Groupings Grade DL Class? • Have Students Create Problems and Trade with Others for Solutions. • Sentence Prompts for Speaking and Writing Literacy • Have Students Ask & Answer Questions. CCLS for Mathematics • Bulletin Board for Reference • Modeling & Repetition
  • 3. 6.3 Number Sense: Decimal Multiplication CCLS for Math Mathematical Practices 5.NBT.7 - Add, subtract, multiply,  Reason abstractly and and divide decimals to hundredths, quantitatively. using concrete models or drawings  Construct viable arguments and strategies based on place and critique the reasoning value, properties of operations, of others. and/or the relationship between  Look for and make use of addition and subtraction; relate the structure. strategy to a written method and explain the reasoning used.
  • 4. TP: 我们用数感做小数乘法 。 We use number sense for decimal multiplication.
  • 6. 今天我们根据被乘数、乘数的大小、关系来 推 论 乘积的大小 , 小数 点的位置 ( 小数点应该在 哪里? ) 10 x 0.9 = Y 请问 : Y>10 ? 或者 Y<10? 为什 么? 与同伴分享你的推论或解释,请用句型: 因为…所以…
  • 7. 生词 数感 :人们对数及它们之间的关系的 认识,和解决实际问题的能力。 比如: 10x0.9 的乘积一定小于 10 。 因为 10x1=10 ,而 0.9<1 , 所以 10x0.9<10 10x0.9=9 < 10x1=10
  • 8. 思考 : 被乘数、乘数和乘积的关系 如果一个乘数是一个小数( 0.55 ),那么无论被 乘 数是一个什么数,它们的乘积一定小于被乘数。 65.30x0.55= ? 因为乘数 0.55<1 ,所以乘积一定会小于 65.30 65.30x0.55=3592 小数点应该在哪里? 因为 0.55 接近一半,而 65.30 的一半大约是 35 ,所
  • 9. 用我们的数感来找出被乘数或乘 数 被乘数是一个什么样的小数才能使下面的乘法 等式成立? _______ x 5.1 的乘积大约是 30 。 思考: 因为 6 乘以 5 等于 30 ,所以被乘 数应 该是一个接近 6 的小数。比如: 6.1 6.1x5.1 的乘积大约是 30 。
  • 10. 用数感推论下列乘积中小数点的位置 1.) 5 x 3.4 = 17 2.) 3.1 x 6.2 = 1922 3.) 0.6 x 0.4 = 24 从 3 题中选出一题,写出推论过程 请用:因为…所以… 和同伴分享你是如何推论的。
  • 11. 用数感推论下列乘积中小数点的位置是正确的,还 是错误的?为什么?如果是错的,请给出正确答案 ,并且解释。 1.) 7.8 x 0.3 = 23.4 2.) 12 x 4.8 = 57.6 3.) 0.6 x 0.7 = 0.042 7.8 x 0.3 = 23.4 是 ______ 的,因为 _____, 而 _______, 所以 ________ 。
  • 12. 请一边观看一边思考,并且用 你的数感回答问题 https://www.pearsonsuccessnet.com/snpapp/login/login.jsp
  • 14. 姓名:__________ 日期:________ 下列 1 和 2 乘法题中的乘积缺少小数点,请你用数感把小数点填写 到正确的位置。然后请解释为什么。 因为…, 而…, 所以…。/ 因为…,所以…。 1. 5.01 x 3 = 1503 _____________________________________________ _____________________________________________ 2. 1.8 x 1.9 = 342 _____________________________________________ _____________________________________________ 3. 请判断乘积的小数点位置是否正确。如果不正确,请 给出正确答案,并且解释为什么。请用:因为…, 而…, 所 以…。/ 因为…,所以…。 1.1 x 13.8 = 1.518 _____________________________________________ _____________________________________________
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