Algebra 1: Lesson 1 (Part 2)
Presentation
•
Mathematics
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6th - 8th Grade
•
Practice Problem
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Hard
Ally R
FREE Resource
6 Slides • 0 Questions
1
Lesson 1
part 2
Classifying Real Numbers
2
Here are 2 subsets of numbers:
A = {2, 4, 6, 8, 10, 12}
B = {3, 6, 9, 12}
3
A set of numbers has closure, or is closed, under a given operation (example: adding subtracting) if the outcome of the operation is also a number of the set.
The set of whole numbers is closed under addition.
2 + 3 = 5
whole number + whole number = whole number
4
Sometimes a statement is false, and we need to provide a counterexample! An example that proves a statement is indeed false.
The set of whole numbers is closed under subtraction.
FALSE
Counterexample:
4 - 6 = -2
whole number - whole number = integer
5
6
Lesson 1
part 2
Classifying Real Numbers
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