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Math 9/7-9/10

Math 9/7-9/10. 9-7-10 Multiplying and Dividing Decimals Review. Multiplying Decimals Animation : www.mathsisfun.com/.../decimals-multiplying-animation.html Watch a teacher teach the lesson: http://video.yahoo.com/watch/1434435?fr=yvmtf.

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Math 9/7-9/10

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  1. Math 9/7-9/10

  2. 9-7-10 Multiplying and Dividing Decimals Review Multiplying Decimals Animation: www.mathsisfun.com/.../decimals-multiplying-animation.html Watch a teacher teach the lesson: http://video.yahoo.com/watch/1434435?fr=yvmtf Computation: You want to buy 5 packs of chicken at $1.99 each. How much will the total be? Estimate to the nearest dollar. 1. You want to buy 3 gallons of Edy’s Private Selection Icecream. How much will you spend? 2. You need 2 boxes of cereal. How much will you spend?

  3. Dividing Decimals… You are buying snacks for the class. You are making a salad for a dinner party. Each cucumber is 58 cents. You have spent $1.74 on cucumbers. How many cucumbers did you buy? • These Goldfish boxes are 2 FOR 6.99. How much is each box?

  4. You have been taken to another planet. • The head alien will not let you go home until you explain how to multiply and divide decimals. • Task: • Draw a step-by-step instruction manual on the following: • Multiplying decimals • Dividing Decimals • Your manual must have: • An example of each type of problem • Each step should be labeled.

  5. Ticket out of the door… • Read the problem • Decide which strategy you will use. • Solve the problem. • Explain your answer.

  6. 9/8/10 Modeling Multiplication of Decimals • d Shade in UP AND DOWN (green pencil) .6 or 6/10 Shade in Side to Side (yellow pencil) .3 or 3/10 • Now, shade in: • .6 UP AND DOWN with a green pencil. • .3 SIDE TO SIDE with a yellow pencil 1. What is the multiplication problem? 2. Count the squares that are both green and yellow. What is the answer?

  7. More Practice… • .4X.8 • .5x.9 • .6x.4

  8. Another way to model…

  9. Use flats, longs, and units…

  10. 1.Place your 3.2 horizontally.2. Place the 2.4 vertically2. Use your base ten blocks to fill in the remaining spaces.3. The areas you have left will be filled with UNITS.

  11. Ticket out of the door… • Read the problem • Decide which strategy you will use. • Solve the problem. • Explain your answer.

  12. 9/9/10Working from the solution to the problem… • Use three hundreds grids OR draw three grids on a piece of graph paper. (10 by 10 array). • On grid #1: draw the decimal that is represented vertically (up and down). • On grid #2: draw the decimal that is represented horizontally (side by side). • On grid #3: draw both decimals and show the product of overlapping colors. • What is the problem? What is the product?

  13. Practice, practice, practice….. • Create the following multiplication models: • .6x.8 • .7x.4 • .9x.2 • .6x.7 • Steps: • Draw the first decimal up and down. (Green pencil) • Draw the second decimal side by side. (Blue Pencil) • Draw both decimals on the third grid with the same colors. • Count the colors that overlapped. • Write the problem • Write the product • Check your work by multiplying the decimals.

  14. Visual Practice… What would this multiplication problem and product be?

  15. Review the patterns.

  16. Ticket out of the door… • Read the problem • Decide which strategy you will use. • Solve the problem. • Explain your answer.

  17. 9/10/10 Important Vocabulary

  18. How are you doing?

  19. Ticket out of the door… • Read the problem • Decide which strategy you will use. • Solve the problem. • Explain your answer.

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