To form English numbers from thirteen to nineteen, we add the word teen to the number. For multiples of ten such as sixty, we add -ty to the base. However, the pattern is not completely regular.
The numbers eleven and twelve are quite different from one and two. From thirteen to nineteen, however, we see that the numbers end with teen. The pattern is the number followed by teen. This is true for the numbers fourteen, sixteen, seventeen and nineteen. With the numbers thirteen, fifteen and eighteen, we notice that they are irregular. The number eighteen is written with only one t.
For the numbers from twenty to ninety, the ending is -ty. The numbers sixty, seventy and ninety are completely regular. However, this is not the case for twenty, thirty, forty, fifty or eighty.
English numbers follow certain patterns. From thirteen to nineteen, the ending is -teen and for twenty to ninety, the ending is -ty. A number of numbers, though, are irregular. This is common in not only English but also in other languages.
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