Dimensional Analysis Money Conversions

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1 Dimensional Analysis Money Conversions

2 Today you ll learn how to use dimensional analysis to convert money.

3 By the end of the lesson, you will: Use dimensional analysis: To convert U.S. dollars to money from other countries To convert money from other countries to U.S. dollars CA Math Content Standard Measurement and Geometry Use measures expressed as rates and measures expressed as person-days to solve problems; check the units of the solutions; and use dimensional analysis to check the reasonableness of the answer.

4 Why Am I Learning This? So you can use dimensional analysis in the real world. And be able to answer questions on the CAHSEE and the State CST tests.

5 Dimensional Analysis is using unit analysis to help make conversions from one unit to another.

6 Use dimensional analysis to convert the units for this situation: I have ten dollars. How many dimes are in ten dollars?

7 Use dimensional analysis to write the expression to change the units for a situation. There are five steps: 1. Read the situation. Identify the original units. 2. Write the original units as a fraction. 3. Decide what is the conversion factor for the new unit. 4. Be sure to set up the problem so the original units will divide out. 5. Simplify the expression and divide out the common units Write this in your notes

8 Write in your notes... Objective: I will be able to use dimensional analysis to convert money What are the steps to use dimensional analysis? 1. Read the situation. Identify the original units. 2. Write the original units as a fraction. 3. Decide what is the conversion factor for the new unit. 4. Be sure to set up the problem so the original units will divide out. 5. Simplify the expression and divide out the common units

9 Step 1: Read the problem and identify the original units. I have ten dollars. How many dimes are in ten dollars? Hint: The units come after the number.

10 Step 2: Write the original units as a fraction. I have ten dollars. How many dimes are in ten 10 dollars 1 dollars?

11 Step 3: Write multiplication symbol and draw the fraction bar. I have ten dollars. How many dimes are in ten dollars? 10 dollars 1

12 What is the conversion factor for dollars to dimes?

13 Step 4: Use the conversion factor in the second fraction. I have ten dollars. How many dimes are in ten dollars? 10 dollars 1 10 dimes 1 dollar Write units in the second fraction so that the original units divide out and leave the new unit.

14 Step 5: Simplify the expression and divide out the common units I have ten dollars. How many dimes are in ten dollars? 10 dollars 1 10 dimes 1 dollar = 100 dimes 1 Be sure the original units divide out.

15 Now let s change 10 pounds to U.S. dollars. Conversion Factor: (varies daily) One pound is approximately 2.04 dollars

16 Let s convert pounds to dollars using dimensional analysis Write the given units. Multiply by the conversion factor 10pounds dollars = 20.4dollars 1pound = 20.4

17 A ship from China is coming to the Port of Long Beach. The captain has 2500 yuans. How many U.S. dollars does he have?

18 Conversion Factor: (varies daily) One yuan is approximately dollars Change yuan to dollars.

19 Let s convert yuan to dollars using dimensional analysis. Write the given units. Multiply by the conversion factor 2500 yuan dollar = dollars 1yuan =

20 In pairs: Determine which partner will be person A and which is person B Person A: Tell your partner what is dimensional analysis? Person B: Tell your partner he or she is correct, or tell your partner the correct definition. Dimensional analysis is using unit analysis to help do conversions from one unit to the next.

21 Is this correct? To change 100 dollars to yuan, you would write the following expression. Conversion factor: 1 dollar = 7.57 yuan 100dollars 7.57 yuan 1 1dollar Don t say the answer out loud, wait for the count of three. Yes Tell your partner how you know this is the correct expression. I will pick a person at random to explain.

22 Partner Work How do you convert money from one country to another?

23 In pairs: Determine which partner will be person A and which is person B Person A: Tell your partner how to convert money from one country to another? Person B: Tell your partner he or she is correct, or tell your partner the correct definition. Write an expression using dimensional analysis to eliminate the original units.

24 Practice Look at the conversion chart and use dimensional analysis to convert the money to the correct unit.

25 A B C D Country Money One dollar in Foreign currency Foreign Currency in one dollar Britain Pound $1 = 0.49 pound 1 pound = $2.04 France Euro $1 = 0.73 euro 1 euro = $1.38 Mexico Peso $1 = pesos 1 peso = $ Ten dollars to euros. 2. One hundred dollars to pounds. 3. One hundred pesos to dollars.

26 Country Money One Dollar in Foreign currency Foreign Currency in one dollar Britain Pound France Euro Mexico Peso Ten dollars to euros. 10 dollars euros 1dollar = 7.30 euros 2. One hundred dollars to pounds 100dollars 0.49pounds = 49.00pounds 1 1 dollar 3. One hundred pesos to dollars. 100 pesos dollars = 93.00dollars 1 peso

27 Independent Practice Complete the Money Conversion Worksheet. Work alone Compare answers with a partner to decide the correct answer The teacher will select various students to explain the problems

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