Numbers...30!

Do you remember the numbers from 1 to 20? Today let's have a look to numbers from 21 to 30.
21: twenty-one
22: twenty-two
23: twenty-three
24: twenty-four
25: twenty-five
26: twenty-six
27: twenty-seven
28: twenty-eight
29: twenty-nine
30: thirty

Can you count now from 30 to 40? It's easy!