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Percent Equation

7th and 8th Grade Math
    Brandon Connor
Percent Equation
• Percent x Whole = Part
  – 10% of 100 = n
  – Change Percent to a decimal
  – Of means MULTIPLY!!
  – .10 x 100 = 10
Percent Equation
• Percent x Whole = Part
  – 10% of What number equals 10?
  – 10% of n = 10
  – Change percent to a decimal.
  – .10 x n = 10
  – .10n=10
  – Get n alone on one side of equation
  – .10n/.10=10/.10
  – n=100
Percent Equation
• Percent x Whole = Part
  – What percent of 100 is 10?
  – n of 100 = 10
  – n x 100 = 10
  – 100n=10
  – Get n alone on one side of equation
  – 100n/100=10/100
  – n=.10 or 10%
Percent Equation
• You are at a restaurant. Your bill is $100. You
  want to tip the waitress 10%. How much
  money are you going to leave for the
  waitress?
  – 10% of $100 = n
  – .10 x $100 = $10

  You would tip the waitress $10.
Work Cited
• http://www.virtualnerd.com/pre-
  algebra/percents/equation-examples.php
• http://www.google.com/imgres?um=1&hl=en&sa=N&biw=
  1366&bih=598&tbm=isch&tbnid=chXo0_6dhhTjTM:&imgre
  furl=http://www.virtualnerd.com/algebra-1/linear-
  equations-solve/percent-equation-
  definition.php&docid=wGWOwS7oL2VOKM&imgurl=http:/
  /www.virtualnerd.com/images/Tutorial/PreAlg_07_01_000
  6-diagram_thumb-lg.png&w=338&h=190&ei=GfiFT_-
  XL6nt0gHWqMW2Bw&zoom=1&iact=rc&dur=129&sig=102
  076462146406110894&page=1&tbnh=86&tbnw=153&start
  =0&ndsp=21&ved=1t:429,r:6,s:0,i:82&tx=59&ty=4
Percent Equation
• You spent $100 on a pair of shoes. You saved
  $10. What percent off did you receive?

  – n of $100 = $10
  – 100n=10
  – 100n/100=10/100
  – n=.10

  – 10%

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Percent equation

  • 1. Percent Equation 7th and 8th Grade Math Brandon Connor
  • 2. Percent Equation • Percent x Whole = Part – 10% of 100 = n – Change Percent to a decimal – Of means MULTIPLY!! – .10 x 100 = 10
  • 3. Percent Equation • Percent x Whole = Part – 10% of What number equals 10? – 10% of n = 10 – Change percent to a decimal. – .10 x n = 10 – .10n=10 – Get n alone on one side of equation – .10n/.10=10/.10 – n=100
  • 4. Percent Equation • Percent x Whole = Part – What percent of 100 is 10? – n of 100 = 10 – n x 100 = 10 – 100n=10 – Get n alone on one side of equation – 100n/100=10/100 – n=.10 or 10%
  • 5. Percent Equation • You are at a restaurant. Your bill is $100. You want to tip the waitress 10%. How much money are you going to leave for the waitress? – 10% of $100 = n – .10 x $100 = $10 You would tip the waitress $10.
  • 6. Work Cited • http://www.virtualnerd.com/pre- algebra/percents/equation-examples.php • http://www.google.com/imgres?um=1&hl=en&sa=N&biw= 1366&bih=598&tbm=isch&tbnid=chXo0_6dhhTjTM:&imgre furl=http://www.virtualnerd.com/algebra-1/linear- equations-solve/percent-equation- definition.php&docid=wGWOwS7oL2VOKM&imgurl=http:/ /www.virtualnerd.com/images/Tutorial/PreAlg_07_01_000 6-diagram_thumb-lg.png&w=338&h=190&ei=GfiFT_- XL6nt0gHWqMW2Bw&zoom=1&iact=rc&dur=129&sig=102 076462146406110894&page=1&tbnh=86&tbnw=153&start =0&ndsp=21&ved=1t:429,r:6,s:0,i:82&tx=59&ty=4
  • 7. Percent Equation • You spent $100 on a pair of shoes. You saved $10. What percent off did you receive? – n of $100 = $10 – 100n=10 – 100n/100=10/100 – n=.10 – 10%