1. Ecole Supérieure de Commerce de Neuchâtel Pierre Marchal
Number Sets 1MPES
Ecole Supérieure de Commerce de Neuchâtel
Pierre Marchal
Attribute to: Pierre Marchal (Jean-Piaget High School)

2. Objectives of the course
By the end of the course, you should be able to:
Define and characterize number sets
Differentiate numbers (nature, writing, and ranking)
Differentiate between being a member and being a subset
Rank numbers correctly

3. Number Sets: Definition
is the set of numbers
is the set of numbers
is the set of (positive and negative)
is the set of numbers (fractions)
is the set of numbers (including irrational numbers)
Natural/Counting
Whole
Integers
Rational
Real

4. Number Sets: Examples
Natural/Counting
Whole
Integers
Rational
Real

5. Sketching the Number Sets
: natural numbers
: whole numbers
: integers
: rational numbers
: real numbers
1.2 π 1 -5
234 … …
-1000 … …

6. Is member of vs. is subset of
A number a set, noted
Example:
A number a set, noted
A set of an other set, noted
A set of an other set, noted
is member of
is not member of
is a subset
is not a subset

7. Examples of Application

8. Complete with the correct set (s)25
1.4
2.5
-0.4
-17 , , , ,

9. Writing Numbers
Be careful with rational, they may be written in several ways:
It is always necessary to reduce fractions ! = = = = =
= 2

10. Ranking Numbers 5
- 5
- 5 5 10

11. By the end of this course
You are able to:
Define and characterize number sets
Differentiate numbers (nature, writing, and ranking)
Differentiate between being a member of and being a subset of
Rank numbers correctly

12. Thank you for your ATTENTION
See you for the next course, learn your lesson!
Thank you for your ATTENTION