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Decimals

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Decimals

  1. 1. 6-5 Multiplying and Dividing Decimals Objective: Multiply and divide decimals.
  2. 2. 5-Minute Check1. Name the multiplicative inverse of 12/5.
  3. 3. 5-Minute Check1. Name the multiplicative inverse of 12/5. 5/ 7
  4. 4. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½
  5. 5. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½ -4
  6. 6. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½3. n = 5/12 ÷ 7/15
  7. 7. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½3. n = 5/12 ÷ 7/15 /28 25
  8. 8. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½3. n = 5/12 ÷ 7/15Evaluate each expression if m = 1/3 and n = -2/94. m/n
  9. 9. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½3. n = 5/12 ÷ 7/15Evaluate each expression if m = 1/3 and n = -2/94. m/n -1½
  10. 10. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½3. n = 5/12 ÷ 7/15Evaluate each expression if m = 1/3 and n = -2/94. m/n5. n/m2
  11. 11. 5-Minute Check1. Name the multiplicative inverse of 12/5.Estimate the solution to each equation. Then solve. Write the solution in simplest form.2. x = -6 ÷ 1½3. n = 5/12 ÷ 7/15Evaluate each expression if m = 1/3 and n = -2/94. m/n5. n/m2 -2
  12. 12. 6-5 Multiplying and Dividing Decimals When multiplying decimals, the number of decimal places in the product is the same as the sum of the decimal places in the factors.
  13. 13. 6-5 Multiplying and Dividing DecimalsExample 1Solve y = (10.7)(0.13). 10.7 1 decimal place
  14. 14. 6-5 Multiplying and Dividing DecimalsExample 1Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places
  15. 15. 6-5 Multiplying and Dividing DecimalsExample 1Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321
  16. 16. 6-5 Multiplying and Dividing DecimalsExample 1Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321 1070
  17. 17. 6-5 Multiplying and Dividing DecimalsExample 1Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321 1070 1.391 3 decimal places
  18. 18. 6-5 Multiplying and Dividing DecimalsExample 1Solve y = (10.7)(0.13). 10.7 1 decimal place x0.13 2 decimal places 321 1070 1.391 3 decimal placesy = 1.391
  19. 19. 6-5 Multiplying and Dividing Decimals To divide decimals, multiply both the divisor and the dividend by a power of ten so that the divisor is a whole number. Then divide.
  20. 20. 6-5 Multiplying and Dividing DecimalsExample 2Solve y = 2.25 ÷ 2.5.
  21. 21. 6-5 Multiplying and Dividing DecimalsExample 2Solve y = 2.25 ÷ 2.5.Estimate: 2 ÷ 2 = 12.5)2.25
  22. 22. 6-5 Multiplying and Dividing DecimalsExample 2Solve y = 2.25 ÷ 2.5.Estimate: 2 ÷ 2 = 12.5)2.25 Multiply by 10 to get a whole number in the divisor.
  23. 23. 6-5 Multiplying and Dividing DecimalsExample 2Solve y = 2.25 ÷ 2.5.Estimate: 2 ÷ 2 = 12.5)2.25 Multiply by 10 to get a whole number in the divisor. 0.925)22.5 Divide as with whole numbers. 225
  24. 24. 6-5 Multiplying and Dividing DecimalsExample 2Solve y = 2.25 ÷ 2.5.Estimate: 2 ÷ 2 = 12.5)2.25 Multiply by 10 to get a whole number in the divisor. 0.925)22.5 Divide as with whole numbers. 225x = 0.9 Compare to the estimate.
  25. 25. 6-5 Multiplying and Dividing DecimalsAssignment: 18 – 48 Even, 50 – 62 All. Page: 298+

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