Translation:Elfu kumi na nane
Here's how. This is what I was taught those several years ago back in Kindergarten. Normally people will say "elfu kumi na nane" to mean Eighteen thousand and such. But if you care for accuracy, this is the distinction;
Eighteen thousand - 18,000 - Kumi na nane elfu
Ten thousand and eight - 10,008 - Kumi elfu na nane
What changes is the position of the "elfu".