This is one of those quirky grammar rules that can be confounding because the rule for speaking differs from the rule for writing. Ordinal numbers show order, or a position in a series: first (1st), ...

Ordinals numbers tell you what position something is in. You often use them to rank or order things. Most ordinal numbers end with a 'th' sound, like 'fourth' or 'fifth'. However, they can also end ...

Ordinals numbers tell you what position something is in. You often use them to rank or order things. Most ordinal numbers end with a 'th' sound, like 'fourth' or 'fifth'. However, they can also end ...