Notice that from number twenty and up the Danes say the numbes the other way around than in English. For example 21 becomes: en-og-tyve ([lit: one-and-twenty]). Have a close look at the numbers below.

Counting further up you just continue the pattern above: Start with the ones (1-9) and then the tens (see below)!
(except 10 obviously. See numbers 10 to 20)