Topic 5 - Number systems Flashcards
What notation is used for natural numbers?
N
Give some examples of natural numbers
1,2,3,4,5
What is the definition of natural numbers?
Positive integers
Is 8 a natural number?
Yes
Is -8 a natural number?
No
Is 0.5 a natural number
No
What notation is used for integer numbers?
Z
Give some examples of integer numbers
-2,-1,0,1,2
What is the definition of integer numbers?
Integer numbers are numbers that a whole but can be either positive or negative
Is 8 an integer number?
Yes
Is -8 an integer number?
Yes
Is 8.78 an integer number?
No
What is the notation for rational numbers?
Q
Give some examples of rational numbers
7/2,8/1,100/3
What is the definition of rational numbers?
Numbers that can be written as simple fractions or ratios of integers.
Is √4 a rational number?
Yes √4 = 2 or 2/1
Is -2 a rational number?
Yes
Are prime numbers rational numbers?
Yes as they are still divisible by 1
7/1
What is the notation for irrational numbers?
There isn’t one
Give some examples of irrational numbers
pi, √2, √3, √99
What is the definition of irrational numbers?
An irrational number cannot be written as a ratio of two numbers. Note that not all square roots are irrational.
What is the notation for real numbers?
R
Give some examples of real numbers
1, 12.41, √2, 0, 12/7
What is the definition of real numbers?
They include: whole numbers, integers, rational, irrational numbers; they can be positive, negative or 0.
What are ordinal numbers?
Numbers used to denote the position of an object in relation to a list
Give some examples of ordinal numbers
1st, 2nd, 3rd, 4th
