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DECIMALS

DECIMALS. ARE DELIGHTFUL!!!!. Adding and Subtracting Decimals. What do you need to keep in mind? Line up decimal points. Contestant Pairs--You will be shown three items-- Record your price guess. All Items were found on Walmart.com April 6, 2011.

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DECIMALS

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  1. DECIMALS ARE DELIGHTFUL!!!!

  2. Adding and Subtracting Decimals • What do you need to keep in mind? • Line up decimal points

  3. Contestant Pairs--You will be shown three items-- Record your price guess. All Items were found on Walmart.com April 6, 2011.

  4. Magellan RoadMate 1700 7" Largescreen Portable GPS with Spoken Street Names

  5. Basic Math and Pre-Algebra for Dummies (Paperback)

  6. Better Homes and Gardens Autumn Lane 6-Piece Dining Set, Black and Oak

  7. Record your guess.

  8. Magellan RoadMate 1700 7" Largescreen Portable GPS with Spoken Street Names The price: $148.54

  9. The price: $18.90

  10. Better Homes and Gardens Autumn Lane 6-Piece Dining Set, Black and Oak The Price: $259.99

  11. AND THE TOTAL IS: 121 148.54 18.90 +259.99 $427.43

  12. Subtraction Find the difference between your total and the actual total. Who came the closest without going over?

  13. And our winning contestant pair is:

  14. Multiplying Decimals -Do not line up decimal points -Start with the number with the most digits and place the other number underneath -Multiply, not attending to the decimal points 2.21 x .4 = 2.21 x .4 884

  15. Multiplying Decimals 2.21 x .4 = 2.21 x .4 884 -Next, add the number of digits after the decimal in each factor--Three -Start at the right in your answer and count to the left that many places. That’s where you put the decimal .884

  16. Try a Few Yourself: • .32 x .7 • 3.16 x 1.01 • .018 x .26 • 0.224 • 3.1916 • 0.00468

  17. Get ready to play theGrocery Game You will be shown 4 items, you must determine the cost of each, and you must decide how many of each product you want to buy. All items must be purchased. Your total bill must be between $19.00 & $20.00Let’s view the items and play the game:

  18. Our winning contestant pair is:

  19. Dividing Decimals • Place the first number “inside the box,” the second number outside 12.5 ÷ .3 .3 12.5 • **The key to remember is we always need a whole number as the divisor—the number outside the box • How do we change that number to a whole number?

  20. Dividing Decimals • How do we change that number to a whole number? • We multiply by a power of 10—10,100,1000, etc. • The number of places we move the decimal in the divisor to make it whole is the same number we must move in the dividend

  21. Dividing Decimals • Our new problem is now .3. 12.3. The decimalis placed in this new position in the quotient. 41. 3. 123.

  22. Dividing Decimals • 167.4 ÷ .93 • 9.447 ÷ 6.7 • 35.64 ÷ 33 • 180 • 1.41 • 1.08

  23. Our next game is: Easy as 1-2-3 Place the following items from the current Walmart ad in order from the lowest price to the highest price:

  24. Crisco Vegetable Oil—48 oz

  25. Windex Glass Cleaner-32 fl. oz.

  26. 33.8 oz. Aussie Shampoo or Conditioner

  27. Sally Hensen Diamond Strength Nail Polish 0.45 oz

  28. The correct order is: Windex $ 2.97 Crisco $ 3.34 Nail Polish $ 3.98 Aussie $ 5.97

  29. Our winning contestant pair is:

  30. How much is each product per ounce? Round to the ten-thousandths place. Windex 32 oz $ 2.97 Crisco 48 oz $ 3.34 Nail Polish .45 oz $ 3.98 Aussie 33.8 oz $ 5.97 .0928 .0696 8.844 .1766

  31. To place numbers in order: • 1. Line up decimals • 2. Add zeros as needed • 3. Remove decimal Let’s try this one together: 6.25, 6.205, 6.2, 6.21 First, line up decimals 6.25 6.205 6.2 6.21

  32. To place numbers in order: Next, add zeros as needed: 6.250 6.205 6.200 6.210 Finally, remove decimal and put in order from smallest to largest: 6250 4th 6205 2nd 6200 1st 6210 3rd

  33. Your turn: Place in order from smallest to largest 8.09, 8.9, 8.909, 8.19

  34. Let’s Practice Rounding Decimals: Divide and round to the nearest hundredth: • 263.82 ÷ 4 Divide and round to the nearest thousandth: 8.45 ÷ 0.69

  35. Let’s Practice Order of Operations with Decimals: 3.57 – (0.4)3 x 2.5 ÷ 5 19.36 ÷ (0.24 + 0.26) x (0.4)2

  36. Thank you for playing Decimals are Delightful!!!!

  37. In-Class Problems: • Pg. 166 Section 2.2 -- 12, 14, 15, 16. 19-22 • Pg. 167 Section 2.3 -- 23-26 • Section 2.4 -- 27-30, 33 • Section 2.5 – 34-38 • Pg. 168 Section 2.6 – 51-56

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