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DEDUCTIVE RESONING - PowerPoint PPT Presentation

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DEDUCTIVE RESONING. Observation Questions. 1. What time was it on the clock? 2. How many people were at the scene? How many males? How many females? 3. What day of the month was it?

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observation questions
Observation Questions
  • 1. What time was it on the clock?
  • 2. How many people were at the scene? How many males? How many females?
  • 3. What day of the month was it?
  • 4. Describe the person in the front of the line (kind of clothes, hat or no hat, man or women, tall or short, facial or distinguishing features)
  • 5. Did you notice anything unusual in the scene?
Are there cars parked on the sides of the road?
  • What color is the pickup truck driving in the road?
  • Any minivans around?
  • What does the blue sign say?
  • What's the speed limit?
  • Are there any pedestrians on the road?
what is deductive reasoning
What is Deductive Reasoning?
  • Deductive reasoning is used to some degree in all problem solving. There are some problems that rely on very little besides deductive reasoning to arrive at a solution. We often call these "logical reasoning" problems and they must be worked through piece by piece to get to an answer. Many people find it helpful to make a chart or diagram to keep track of solution parts as they are worked out.
how do you use deductive reasoning
How do you use deductive reasoning?

1. Decide exactly what it is you are trying to find out.

2. Identify all information you have available in the problem.

3. Design a way to record information you have as well as interrelationships between pieces of information.

4. Record all available information and use it to fill in blanks.

5. Look back to ensure each conclusion you make is justified based on the information you have.

Rhonda had signed up for games at the school fun night. For the first set of games, seven other people were assigned to her group to make up four pairs of partners. Rhonda's group list showed her name as well as Darien, Anna, Jon, Christina, Joanne, Marcel, and Michael. When the games started, Darien and his partner were to the left of Marcel. Across from Darien was Rhonda, who was to the right of Jon. Darien's brother's partner, Christina, was across from Marcel. Joanne was not on Marcel's right. Can you name the four pairs of partners?
What is the question asking?
  • Of the 8 students listed in the problem, what are the four sets of partners?
  • What information do we have?
  • 8 student names
  • locations of some of the individuals with respect to others
  • there are four sets of partners
  • What assumptions do we need to make?
  • names are gender-specific when referring to brothers
  • no one else is a part of the group to mix up the partnerships
By drawing a diagram in the form of a square, each partnership can be represented by two blanks, each on one side of the square. This allows the relative direction of across, to the left, and to the right to make sense.
We can start by placing the first pair mentioned, Darien and his partner, somewhere on the square. The starting place doesn't matter because all the information is relative to that first pair, not to any particular side of the square. At the same time we can cross Darien off the list of eight names as he is already placed into our diagram.
The problem tells us Darien and his partner are to the left of Marcel. Picture Darien sitting at a table in the shape of a square. If Darien is to the left of Marcel, Marcel is on Darien's right at the table. We can put Marcel's name in that position and cross him off our list.
The following verse spells out a word, letter by letter.  "My first" refers to the word's first letter, and so on.  What's the word that this verse describes? solution

-My first is in fish but not in snail-My second in rabbit but not in tail-My third in up but not down-My fourth in tiara not in crown-My fifth in tree you plainly see-My whole a food for you and me