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First

Definition Of First

An ordinal number that shows the beginning number of a set is called First.

More About First

'First' is also written as "1st".

Video Examples:Math Addition Lesson for 1st Grade
 

Example of First

Consider the set of vowels, V = {a, e, i, o, u}. This set starts with the letter `a`, so `a` is the First element of the set V.

Solved Example on First

Ques: Find the first number of the set given below.

 example of   
First

Choices:

A. 18
B. 5
C. 8
D. 15
Correct Answer: A

Solution:

Step 1: An ordinal number that shows the beginning number of a set is called First. 
Step 2: In the given set, 18 is the first number.