16.2 If-Then Statements

Learning Resource Type

Classroom Resource

Subject Area

Mathematics

Grade(s)

9, 10, 11, 12

Overview

This informational material will introduce students to if-then logical statements and demonstrate how to represent these statements with symbols in truth tables. It will also describe a contradicting logical argument. There is a corresponding video available. Practice questions with a PDF answer key are provided. In addition, there is a self-checking online practice tool.

Mathematics (2019) Grade(s): 09-12 - Applications of Finite Mathematics

MA19.FM.1

Represent logic statements in words, with symbols, and in truth tables, including conditional, biconditional, converse, inverse, contrapositive, and quantified statements.

UP:MA19.FM.1

Vocabulary

  • Proposition
  • Statement variables
  • Logical operators
  • Truth table
  • Negation
  • Conditional statement
  • Hypothesis/antecedent
  • Conclusion/consequent
  • Converse statement
  • Inverse statement
  • Contrapositive statement
  • Biconditional statement
  • Equivalent statements

Knowledge

Students know:

  • How to determine if a simple statement is true or false.

Skills

Students are able to:

  • Construct a truth table for propositions with a variety of operators.
  • Write a proposition using logical operators and statement variables such as p and q.
  • Write the converse, inverse, contrapositive and biconditional of a conditional statement using logical operators and statement variables.

Understanding

Students understand that:

  • A conditional statement’s validity is based on the validity of its components.
  • Truth tables must contain all possible assignments of true and false for each component.
  • A statement is either true or false.

Body

  1. Represent logic statements in words, with symbols, and in truth tables, including conditional, biconditional, converse, inverse, contrapositive, and quantified statements.
Mathematics (2019) Grade(s): 09-12 - Applications of Finite Mathematics

MA19.FM.2

Represent logic operations such as and, or, not, nor, and x or (exclusive or) in words, with symbols, and in truth tables.

UP:MA19.FM.2

Vocabulary

  • Compound statement
  • Negation
  • Conjunction
  • Disjunction

Knowledge

Students know:

  • A statement is either true or false.
  • A truth table must include every possible assignment of true and false for each component of a compound statement.

Skills

Students are able to:

  • Construct a truth table for a compound statement.
  • Represent compound statements using statement variables and logical operators.

Understanding

Students understand that:

  • The validity of the simple statements that make up a compound statement determine the compound statement’s validity.

Body

  1. Represent logic operations such as and, or, not, nor, and x or (exclusive or) in words, with symbols, and in truth tables.
Mathematics (2019) Grade(s): 09-12 - Applications of Finite Mathematics

MA19.FM.4

Determine whether a logical argument is valid or invalid, using laws of logic such as the law of syllogism and the law of detachment.

UP:MA19.FM.4

Vocabulary

  • Tautology
  • Contradiction
  • Law of syllogism
  • Law of detachment/modus ponens

Knowledge

Students know:

  • How to construct a truth table from a given logic statement.

Skills

Students are able to:

  • Construct valid arguments.
  • Identify the validity of arguments.

Understanding

Students understand that:

  • Truth tables can be used to construct a valid argument or to determine the validity of an argument.
  • In order for an argument to be valid, the form of the argument must be valid.

Body

  1. Determine whether a logical argument is valid or invalid, using laws of logic such as the law of syllogism and the law of detachment. a. Determine whether a logical argument is a tautology or a contradiction.

CR Resource Type

Informational Material

Resource Provider

CK-12

License Type

Custom
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