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Lesson%20 plan%20on%20ratio edu20auth_0e2ad016f3217d6ae5e3be332040759acc230482

  1. 1. Lesson Plan on Ratio Prepared by Gliceryl Mae Manlangit Target Students: Grade Five Subject Matter: Mathematics EDUC 190 A. Motivation Show a photo of Leonardo da Vinci’s Golden Ratio. This is a picture of Leonardo da Vinci’s Golden Ratio. The golden ratio is based on Fibonacci’s numbers where every number in the sequence is the sum of the previous two numbers. The golden ratio is 1. 618 033. In this photo, each succeeding finger bone is 1. 618 the length of the preceding finger bone. The distance from elbow to wrist is 1.618 the distance from wrist to fingertip. It is also said that from the top of the head to the belly button is measured as one, while the measurement from the belly button to the bottom of the feet is 1.618.
  2. 2. B. Objectives  To define ratios  To express ratios in colon notation, in fraction, and in English expression  To find out ratios of word problems  To identify body ratios C. Review of Prior Learning Ask the students about the process of multiplying fractions. Ask for volunteers to multiply these fractions: 2 × 5 3 × 6 6 8 4 8
  3. 3. D. Information and Examples Show a bowl of marbles with red, blue and green colors. How many green marbles are here in the bowl? How many red marbles are there? (Write their answers on the board.) What do you think is the relationship between the green marbles and the red marbles? This relationship is called ratio. Ratios- can be expressed in colon notation (:); in English expression (____ is to ___); or in fraction form (3 ripe mangoes/6 mangoes) Ratio can be defined as:  Part to whole sense- ratio of the number of parts compared to the number of the whole e.g 4 red marbles is to 6 marbles  Part to part sense- describes relationship between two subsets of the same set e.g. 7 blue yo-yos is to 8 green yo-yos  Relationship between two independent sets- describes relationship between two sets that are unrelated e.g. 2 milk cartons is to 8 cookies
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  5. 5.  Ratio as a rate- can describe pricing information e.g. 1 candy is to P1; or can also describe rate e.g. 50 miles per hour Reminder:  Ratios in fraction form should always be labeled to avoid confusion.  Ratios in fraction form may also have 0 as denominator. E. Practice and Feedback Problem solving on ratio In a bag of red and green sweets, the ratio of red sweets to green sweets is 3:4. If the bag contains 120 green sweets, how many red sweets are there? Solution: Assign variables : Let x = red sweets Write the items in the ratio as a fraction.
  6. 6. Step 2: Solve the equation Cross Multiply 3 × 120 = 4 × x 360 = 4x Isolate variable x Answer: There are 90 red sweets. F. Application and Summary Body Ratios Instructions:  Look for a partner.  Cut a string equal to the length of the height of your partner.  Answer the following questions: 1. How many of one of your feet equals to your height? 2. How many of one of our wrist circumference equals to your waist? 3. How many of your waist equals to your height? 4. How many of your ring finger equals to your neck circumference? After the activity, the teacher will ask the students to go back to their proper places. Generalization What are ratios? Expected Response: Ratios describe the relationship between parts to whole, parts to parts, and between two independent sets. How are ratios expressed? ER: Ratios can be written using a colon notation, using English expression, and through fractions <a rel="license" href=""><img alt="Creative Commons License" style="border-width:0" src="" /></a><br /><span xmlns:dc="" property="dc:title">Lesson Plan on Ratio</span> by <span xmlns:cc=""
  7. 7. property="cc:attributionName">Gliceryl Mae Manlangit</span> is licensed under a <a rel="license" href=" sa/3.0/">Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License</a>.