Uh oh! Van Gogh!

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Uh oh! Van Gogh!

• By Caitlin Malone

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• Whats up? My name is Maria. I am in Mr. Wells
  fourth grade class, where we run the school café.
  I just so happen to be the cafés manager!

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• The other day, Mr. Wells introduced a new
  student to the class. His name was Vincent, but
  he wanted us to call him by his last nameVan
  Gogh.

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• Van Gogh was kinda weird. He loved art class

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• but he hated math!

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• Mr. Wells noticed that Van Gogh was having
  trouble
• so he came to me with an idea!

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• Why doesnt Van Gogh help out with the school
  café? he asked. Then he could learn all about
  math!

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• I was about to say that might not be the best
  idea when Mr. Wells added
• After all, youre such a great manager!
• How could I say no?

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• I decided this was too big of a job to do on my
  own, so I asked Joe, Shae, and Nikki to help.

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• Joe suggested that we put him in charge of the
  register. So, Van Gogh became our new cashier!

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• The next day, Van Gogh sold three bags of chips
  to Ms. Honeycutt. The chips cost
• 2.45

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• So, Van Gogh did the problem like this
• 1 1 1
• 2.45
• x 3
• 73.5

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Uh Oh! Van Gogh!
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• Do you see your mistake? asked Joe.
• 2.45
• x 3
• 73.5
• You counted over your decimal place from the
  left, not the right.

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• Remember that the decimal point helps to hold
  the place value. Next time, try estimating before
  you perform the problem.
• If you know that 2 x 3 6, then your answer
  to the problem should be close to that.

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• Van Gogh tried the problem again, this time
  recognizing that the decimal point helps
  determine the value of the number
• 2.45
• x 3
• 7.35

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Way to go! Van Gogh!
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• The following day, a student came up to Van Gogh
  asking for a refund. She had just bought three
  ice cream cones, but realized one friend was
  absent today so she only needed two. She had
  already paid and asked Van Gogh for the amount of
  one cone. The total amount she paid for three
  cones was
• 6.75

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• Van Gogh could not find the price of one cone,
  but he did know that if he divided the total
  amount by three (how many cones she bought) then
  he would know how much to give back
• 125
• 3 6.75

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Uh Oh! Van Gogh!
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• Shae stopped Van Gogh before it was too late.
  You have to remember the decimal point! she
  exclaimed.
• 125
• 3 6.75
• Remember that the decimal point tells us the
  difference between dollars and cents. By
  inserting the decimal point, you are telling the
  customer how many dollars and how many cents
  something is.

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• Van go tried the problem again, this time
  remembering that the decimal point shows the
  difference between whole numbers and parts of the
  whole
• 1.25
• 3 6.75

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Way to go! Van Gogh!
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• Van Gogh was really starting to get it! Then at
  the end of the week, we had a sale at the café,
  making everything
• 20
• Of the original price!!!

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• Mr. Lowery came in after P.E. class very
  thirsty! He asked Van Gogh for a can of soda,
  which was one dollar. Van Gogh knew that twenty
  percent could be written as a decimal, and so he
  did the problem like this
• 1.00
• x .02
• .0200

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Uh Oh! Van Gogh!
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• Nikki came to the rescue! Your decimal point is
  not in the right place to equal twenty percent!
  she pointed out.
• Twenty percent of one-hundred percent is the
  same as the fraction
• _20_
• 100
• And that fraction means twenty hundredths. What
  does twenty hundredths look like as a decimal?

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• Van Gogh remembered that the number value right
  after the decimal point was tenths, so the number
  value after that was hundredths! He thought about
  it and wrote the number like this
• .20
• but that looked like two tenths to Van Gogh. He
  wondered, Does two tenths equal twenty
  one-hundredths?

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• Nikki suggested he look at them both as
  fractions and compare
• _20_ _2_
• 100 10
• Van Gogh remembered that he could cancel out a
  zero from the numerator and denominator because
  they made a fraction equal to one. So, that means
  that they are the same!

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• _20_ _2_ x _10_ _2_ x _1_
• 100 10 10 10 1
• _20_ .20
• 100 222

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• Van Gogh decided to try the problem again
• 1.00
• x .20
• 0.20

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Way to go! Van Gogh!
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• Van Gogh soon became one of the best math
  students in our class! He often did problems on
  the chalkboard to show us how to solve the
  problem.

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• Also, he found other ways to help make our café
  better
• with his art!

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The End