Pre-Algebra Quiz <ul><li>1.  What is one word for a fraction (only ONE word)? </li></ul><ul><li>Calculate 28% of 33. </li>...
Percent… (continued)
A more condensed way to understand percent conversion <ul><li>Percent to Decimal: </li></ul><ul><li>percentage  >  divide ...
Percent of Change <ul><li>A percent that indicates how much a quantity increases or decreases with respect to the original...
Example of Percent Increase/Decrease <ul><li>Original:  $37 </li></ul><ul><li>New:  $70 </li></ul><ul><li>Percent increase...
Example of Percent Increase/Decrease <ul><li>Original:  $70 </li></ul><ul><li>New:  $42 </li></ul><ul><li>Percent increase...
Now you try: <ul><li>Person 1 : Determine whether the problem is a percent increase or decrease problem. </li></ul><ul><li...
Now you try: <ul><li>Person 2 : Determine whether the problem is a percent increase or decrease problem. </li></ul><ul><li...
Now you try: <ul><li>Person 3 : Determine whether the problem is a percent increase or decrease problem. </li></ul><ul><li...
Summary <ul><li>Percent increase / decrease tells us exactly that…how much an amount either increased or decreased compare...
HOMEWORK!   <ul><li>Page 355 </li></ul><ul><ul><li>7, 8, 9, 10, 13, 16, 20, 21 </li></ul></ul>
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Percent Of Change

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Percent Of Change

  1. 1. Pre-Algebra Quiz <ul><li>1. What is one word for a fraction (only ONE word)? </li></ul><ul><li>Calculate 28% of 33. </li></ul><ul><li>You took a test by Mr. Shortess and got 18 questions out of 38 correct. What was your score on the test (as a percentage)? </li></ul>
  2. 2. Percent… (continued)
  3. 3. A more condensed way to understand percent conversion <ul><li>Percent to Decimal: </li></ul><ul><li>percentage > divide > decimal </li></ul><ul><li>37 % > 37 / 100 > .37 </li></ul><ul><li>Decimal to Percent: </li></ul><ul><li>decimal > multiply > percent </li></ul><ul><li>.37 > .37 x 100 > 37% </li></ul>
  4. 4. Percent of Change <ul><li>A percent that indicates how much a quantity increases or decreases with respect to the original amount. </li></ul><ul><li>Percent of change: </li></ul><ul><li>p% = (Amount of increase or decrease) </li></ul><ul><li>(Original amount) </li></ul>
  5. 5. Example of Percent Increase/Decrease <ul><li>Original: $37 </li></ul><ul><li>New: $70 </li></ul><ul><li>Percent increase or decrease? </li></ul><ul><li>($70 - $37) = $33 = .89189 = 89.2 % incr. </li></ul><ul><li>$37 $37 </li></ul>
  6. 6. Example of Percent Increase/Decrease <ul><li>Original: $70 </li></ul><ul><li>New: $42 </li></ul><ul><li>Percent increase or decrease? </li></ul><ul><li>($70 - $42) = $28 = .4 = 40 % decrease </li></ul><ul><li>$70 $70 </li></ul>
  7. 7. Now you try: <ul><li>Person 1 : Determine whether the problem is a percent increase or decrease problem. </li></ul><ul><li>Original: 65 </li></ul><ul><li>New: 117 </li></ul><ul><li>Person 2 : Find the percent increase or decrease. </li></ul><ul><li>Person 3 : Grade the previous partners’ work. </li></ul>
  8. 8. Now you try: <ul><li>Person 2 : Determine whether the problem is a percent increase or decrease problem. </li></ul><ul><li>Original: 87 </li></ul><ul><li>New: 19 </li></ul><ul><li>Person 3 : Find the percent increase or decrease. </li></ul><ul><li>Person 1 : Grade the previous partners’ work. </li></ul>
  9. 9. Now you try: <ul><li>Person 3 : Determine whether the problem is a percent increase or decrease problem. </li></ul><ul><li>Original: 100 </li></ul><ul><li>New: 37.5 </li></ul><ul><li>Person 1 : Find the percent increase or decrease. </li></ul><ul><li>Person 2 : Grade the previous partners’ work. </li></ul>
  10. 10. Summary <ul><li>Percent increase / decrease tells us exactly that…how much an amount either increased or decreased compared to the ORIGINAL amount. </li></ul><ul><li>If the original amount > new amount : percent DECREASE. </li></ul><ul><li>If the original amount < new amount: percent INCREASE. </li></ul>
  11. 11. HOMEWORK!  <ul><li>Page 355 </li></ul><ul><ul><li>7, 8, 9, 10, 13, 16, 20, 21 </li></ul></ul>

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