The tenners in German are pretty easy as well. Take a look:
20 - zwan.zig
30 - drei.ßig (there's always one that wants to be different)
40 - vier.zig
50 - fünf.zig
60 - sech.zig (lost the -s again)
70 - sieb.zig (lost the -en again)
80 - acht.zig
90 - neun.zig
100 - hund.ert (looks like hund.red, just nicer :P)
1000 - tausend (looks pretty much like thousand if you ask me)

I hope you see that instead of -ty in EN we use -zig in DE:
twen.ty = zwan.zig and that's about everything you need to remember.

Pronunciation wise you'll struggle with "sech.zig" but if you remember the pronunciation of "ich", you should get this right soon enough.