Converting Customary Units

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Converting Customary Units

  1. 1. Pre-Algebra Pd. 3 Date: 1/14/2009
  2. 2. Conversions <ul><li>Objective: To convert linear measurements within the same system </li></ul>
  3. 3. <ul><li>To change units: </li></ul><ul><li>Multiply when going from larger units to smaller units. </li></ul><ul><li>5 lb = ___ oz </li></ul><ul><li>5 ∙ 16 = 80 oz </li></ul>Multiply
  4. 4. <ul><li>Divide when going from smaller units to larger units. </li></ul><ul><li>28 fl oz = __ c </li></ul><ul><li>28 ÷ 8 = 3 ½ c </li></ul>Divide
  5. 5. <ul><li>Ex. 1 :How many hours are in 31 days? </li></ul><ul><li>31 days = ___ h </li></ul><ul><li>(larger to smaller) </li></ul><ul><li>MULTIPLY </li></ul>
  6. 6. 31 ∙ 24 = 744 hrs
  7. 7. <ul><li>Ex. 2 :How many minutes are there in 840 seconds? </li></ul><ul><li>840 sec = ____ min (Smaller to larger) </li></ul><ul><li>DIVIDE </li></ul>
  8. 8. 840 ÷ 60 <ul><li>= 14 min </li></ul>
  9. 9. <ul><li>C/W #1: </li></ul><ul><li>How many days are there in 3 years? </li></ul><ul><li>3 y = ____ d </li></ul><ul><li>3 ∙ 365 = 1095 days </li></ul>
  10. 10. <ul><li>C/W #2: </li></ul><ul><li>How many seconds are there in 15 minutes? </li></ul><ul><li>15 min = ___ sec </li></ul><ul><li>15 ∙ 60 = 900 sec </li></ul>
  11. 11. <ul><li>C/W: Practice WS #13-18 </li></ul>
  12. 12. Let’s work with Length . . .
  13. 13. <ul><li>Ex. 3 : 96 in = ___ ft </li></ul><ul><li>(small to large) </li></ul><ul><li>DIVIDE </li></ul><ul><li>96 ÷ 12 </li></ul><ul><li>= 8 ft </li></ul>
  14. 14. <ul><li>Ex 4. : 3 mi = ___ ft </li></ul><ul><li>(large to small) </li></ul><ul><li>MULTIPLY </li></ul><ul><li>3 ∙ 5280 = 15,840 ft </li></ul>
  15. 15. <ul><li>3 mi = ___ in </li></ul><ul><li>Refer to PSSA Formula Sheet </li></ul><ul><li>Calculate how many inches in one mile. </li></ul><ul><li>______in = 1 mi </li></ul>63,360
  16. 16. <ul><li>3 mi = ________ in </li></ul><ul><li>3 ∙ 63,360 = 190,080 in </li></ul>190,080
  17. 17. <ul><li>C/W: Practice WS #1 - 6 </li></ul>
  18. 18. <ul><li>Customary Measures </li></ul><ul><li>Let’s see if “ The Gallon Man ” can help! </li></ul><ul><li>or Refer to PSSA Formula Sheet </li></ul>
  19. 19. <ul><li>G </li></ul>Q Q Q Q P P P P P P P P
  20. 20. <ul><li>C/W: </li></ul><ul><li>Convert the following : </li></ul><ul><li>1. 8 gal = ___ qt </li></ul><ul><li>2. 96 oz = ___ lb </li></ul><ul><li>3. 30 lb = ___ oz </li></ul><ul><li>4. 26T = ___ lb </li></ul><ul><li>5. 96 qt = ___ gal </li></ul>
  21. 21. <ul><li>H/W : Customary Conversions WS </li></ul><ul><li>& finish Practice WS </li></ul>

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