What Are Ordinal Numbers From 1 To 100? The ordinal numbers from 1 to 10 are 1st – First, 2nd – Second, 3rd – Third, 4th – Fourth, 5th – Fifth, 6th – Sixth, 7th – Seventh, 8th – Eighth, 9th – Ninth and 10th – Tenth respectively. How do you write ordinal numbers? ‘-st’
Is Every Totally Ordered Set Well-ordered? By definition, any well-ordered set is totally ordered. However, the converse is not true – the set of integers which is totally ordered, is not well-ordered under the standard ordering (since itself and some its subsets do not have least elements). Although, any finite totally ordered set is well-ordered.