Docstoc

Translating Expressions

Document Sample
Translating Expressions Powered By Docstoc
					Translating Expressions

I. Learning Objectives

   Cognitive:        Translate expressions such as ½ of 2/3, 2/3 of 1/6 to mathematical sentences
   Psychomotor:      Illustrate expressions using shaded regions
   Affective:        Show resourcefulness in doing one's project

II. Learning Content

   Skills:           1. Translating expressions such as ½ of 2/3, 2/3 of 1/6
                     2. Multiplying a fraction by another fraction
   References:       BEC-PELC II E 1.2.1 & E 2
   Materials:        flash cards, cutouts of fractions, learning activity sheet, chart showing
                     illustrations
   Value:            Resourcefulness

III. Learning Experiences

   A. Preparatory Activities

      1. Drill
         Contest on basic multiplication facts using flash cards.



      2. Review
         Naming fractions
         Give the fraction for the shaded part.




      3. Motivation
             Get ½ sheet of Grade 4 paper. Fold ½ of your paper. What is ½ of a half? What word in
         this sentence has an equivalent symbol in mathematics? What symbol car] be replaced by
         the word "of"?

   B. Developmental Activities

      1. Presentation

                  Nancy found a piece of white cloth in an old chest of her grandmother. She cut 2/3 of
             it, then she used ½ of this for her apron's pockets. What part of the whole piece of cloth
             did Nancy use for her apron's pockets?

         a. Help the pupils in the analysis of data.

             1. What kind of a girl is Nancy?
             2. If you were Nancy, would you do the same? Why?
             3. What part of the cloth did Nancy cut?
     4. What part of the cloth did Nancy use for the apron's pockets?
     5. Write the mathematical sentence.

  b. Help them visualize and interpret the multiplication sentence.



     1. Show them this illustration.
     2. Ask them to shade 2/3 of this illustration then doubly shade ½ of it.




  c. Present the multiplication sentence from the expression.




  d. Present another example.




2. Group Activity

  a. Write the mathematical sentence for the following expressions.




  b. Translate the following expressions to mathematical sentences then find the product.




  c. Illustrate the following expressions using shaded regions and translate into mathematical.




3. Generalization

  How do you translate expressions such as ½ of 2/3 into mathematical sentence?
                To translate expressions like ½ of 2/3 into mathematical sentence, we change "of" to
            "x" symbol which means 'times' to form the multiplication sentence.

   C. Application

      Read and solve on your paper.

            During a tooth-brushing demonstration for dental week, several Grade 4 pupils used ½ of
         the ¾ full tube of toothpaste. What part of the whole tube of toothpaste was used?

IV. Evaluation

   1. Translate the following expressions to multiplication sentences.



   2. Complete the data in the chart.




   3. Name the double-shaded region by writing two fractions using the word "of" then translate them
      into a multiplication sentence.




V. Assignment

   Translate the following expressions to multiplication sentence.