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5 Minute Check

5 Minute Check. Complete in your notebook. Find each sum 1. 4.9 + 3.0 2. 0.796 + 13 Find the difference. 3. 19.86 - 4.94 4. 82 – 67.18. 5 Minute Check. Complete in your notebook. Find each sum 1. 4.9 + 3.0. 5 Minute Check. Complete in your notebook.

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5 Minute Check

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  1. 5 Minute Check Complete in your notebook. Find each sum 1. 4.9 + 3.0 2. 0.796 + 13 Find the difference. 3. 19.86 - 4.94 4. 82 – 67.18

  2. 5 Minute Check Complete in your notebook. Find each sum 1. 4.9 + 3.0

  3. 5 Minute Check Complete in your notebook. Find each sum 1. 4.9 + 3.0 4.9 + 3.0 7.9

  4. 5 Minute Check Complete in your notebook. Find each sum 2. 0.796 + 13

  5. 5 Minute Check Complete in your notebook. Find each sum 2. 0.796 + 13 13.000 We can annex zeros, if needed. + 0.796 13.796

  6. 5 Minute Check Complete in your notebook. Find the difference. 3. 19.86 - 4.94

  7. 5 Minute Check Complete in your notebook. Find the difference. 3. 19.86 - 4.94 19.86 - 4.94 14.92

  8. 5 Minute Check Complete in your notebook. Find the difference. 4. 82 – 67.18

  9. 5 Minute Check Complete in your notebook. Find the difference. 4. 82 – 67.18 82.00 Annex zeros - 67.18 14.82

  10. Tuesday, Oct 8 Lesson 3.3 Multiplying Decimals by Whole Numbers

  11. Multiplying Decimals by Whole Numbers Objective: To understand how to multiply decimals by whole numbers.

  12. Multiplying Decimals by Whole Numbers At the end of this lesson you should be able to answer the following question. How can estimating products help place a decimal correctly?

  13. Multiplying Decimals by Whole Numbers To multiply a decimal and whole number, multiply as normal and then place the decimal point.

  14. Multiplying Decimals by Whole Numbers Find the product of 4 and .83. First, round the numbers to the nearest whole number to get an estimate. What does .83 round to? Digits from 0 to 4 round down and digits from 5-9 round up.

  15. Multiplying Decimals by Whole Numbers Find the product of 4 and .83. First, round the numbers to the nearest whole number to get an estimate. What does .83 round to? 1 4 x 1 = 4, so 4 x .83 ≈ 4

  16. Multiplying Decimals by Whole Numbers Find the product of 4 and .83. To multiply decimals. Step 1 – Stack the numbers with the number with the most digits on top. .83 x 4

  17. Multiplying Decimals by Whole Numbers Find the product of 4 and .83. To multiply decimals. Step 2 – Multiply the digits. .83 x 4 332

  18. Multiplying Decimals by Whole Numbers Find the product of 4 and .83. To multiply decimals. Step 3 – Determine the number of decimal places in the factors to locate the decimal place in the product. .83 2 decimal places x 4 3.32 2 decimal places Is this a reasonable answer?

  19. Multiplying Decimals by Whole Numbers Find the product of 4 and .83. Is this a reasonable answer? 3.32 ≈ 4

  20. Multiplying Decimals by Whole Numbers Find the product of 3 and 14.2. Estimate?

  21. Multiplying Decimals by Whole Numbers Find the product of 3 and 14.2. Estimate? 3 x 14 = 42 Step 1 - ?

  22. Multiplying Decimals by Whole Numbers Find the product of 3 and 14.2. 3 x 14.2

  23. Multiplying Decimals by Whole Numbers Find the product of 3 and 14.2. 14.2 x 3 Step 2 - ?

  24. Multiplying Decimals by Whole Numbers Find the product of 3 and 14.2. 14.2 x 3 426 Step 3 - ?

  25. Multiplying Decimals by Whole Numbers Find the product of 3 and 14.2. 14.2 1 decimal place x 3 42.6 1 decimal place Does this seem reasonable?

  26. Multiplying Decimals by Whole Numbers Find the product of 3 and 14.2. 14.2 1 decimal place x 3 42.6 1 decimal place Does this seem reasonable? 42.6 ≈ 42

  27. Multiplying Decimals by Whole Numbers Find the product of 4 and .95. (Do this on your own)

  28. Multiplying Decimals by Whole Numbers Find the product of 4 and .95. Estimate ?

  29. Multiplying Decimals by Whole Numbers Find the product of 4 and .95. Estimate ? 4 x 1 = 4 Actual product?

  30. Multiplying Decimals by Whole Numbers Find the product of 4 and .95. .95 2 decimal places x 4 3.80 2 decimal places Does this sound reasonable?

  31. Multiplying Decimals by Whole Numbers Find the product of 4 and .95. .95 2 decimal places x 4 3.80 2 decimal places Does this sound reasonable? 3.8 ≈ 4

  32. Multiplying Decimals by Whole Numbers Find the product of 2 and .018. (Do this on your own)

  33. Multiplying Decimals by Whole Numbers Find the product of 2 and .018. Estimate?

  34. Multiplying Decimals by Whole Numbers Find the product of 2 and .018. Estimate? 2 x 0 = 0 Actual product?

  35. Multiplying Decimals by Whole Numbers Find the product of 2 and .018. .018 3 decimal places x 2 .036 3 decimal places Make sure you multiply the zeros. You may need them later.

  36. Multiplying Decimals by Whole Numbers Find the product of 2 and .018. .018 3 decimal places x 2 .036 3 decimal places Does this sound reasonable?

  37. Multiplying Decimals by Whole Numbers Find the product of 2 and .018. .018 3 decimal places x 2 .036 3 decimal places Does this sound reasonable? .036 ≈ 0

  38. Multiplying Decimals by Whole Numbers Find the product of 4 and 0.0027. (Do this on your own)

  39. Multiplying Decimals by Whole Numbers Find the product of 4 and 0.0027. Estimate?

  40. Multiplying Decimals by Whole Numbers Find the product of 4 and 0.0027. Estimate? 4 x 0 = 0 Actual product?

  41. Multiplying Decimals by Whole Numbers Find the product of 4 and 0.0027. 0.0027 4 decimal places x 4 0.0108 4 decimal places Does this sound reasonable?

  42. Multiplying Decimals by Whole Numbers Find the product of 4 and 0.012. 0.012 3 decimal places x 4 0.048 3 decimal places Does this sound reasonable? 0.0108 ≈ 0

  43. Multiplying Decimals by Whole Numbers A sheet of printer paper is 8.5 inches by 11 inches. What is the area of the paper? (Hint: area = length x width) (Do this on your own)

  44. Multiplying Decimals by Whole Numbers A sheet of printer paper is 8.5 inches by 11 inches. What is the area of the paper? (Hint: area = length x width) Estimate?

  45. Multiplying Decimals by Whole Numbers A sheet of printer paper is 8.5 inches by 11 inches. What is the area of the paper? (Hint: area = length x width) Estimate? 9 x 11 = 99 Actual answer?

  46. Multiplying Decimals by Whole Numbers A sheet of printer paper is 8.5 inches by 11 inches. What is the area of the paper? (Hint: area = length x width) 8.5 1 decimal place x 11 85 +85 0 93.5 1 decimal place Is this a reasonable answer?

  47. Multiplying Decimals by Whole Numbers A sheet of printer paper is 8.5 inches by 11 inches. What is the area of the paper? (Hint: area = length x width) 8.5 1 decimal place x 11 85 +85 0 93.5 1 decimal place Is this a reasonable answer? 93.5 ≈ 99

  48. Multiplying Decimals by Whole Numbers A batch of trail mix calls for 1.2 pounds of dry cereal. Kyle is making 5 batches of trail mix. He already has 2 pounds of dry cereal. How many more pounds of dry cereal does he need? (Do this on your own)

  49. Multiplying Decimals by Whole Numbers A batch of trail mix calls for 1.2 pounds of dry cereal. Kyle is making 5 batches of trail mix. He already has 2 pounds of dry cereal. How many more pounds of dry cereal does he need? Estimate?

  50. Multiplying Decimals by Whole Numbers A batch of trail mix calls for 1.2 pounds of dry cereal. Kyle is making 5 batches of trail mix. He already has 2 pounds of dry cereal. How many more pounds of dry cereal does he need? Estimate? 1 x 5 = 5 5 – 2 = 3 Actual answer?

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