七八九十 - Seven, eight, nine and ten

Today's chinese words of the day are 七八九十 which mean seven, eight, nine and ten respectively.

In mandarin 七八九十 are pronounced qī bā jiǔ shí.
To wrap up numbers I thought we should finish with the last four numbers. With these all numbers from 1 to 99 can be formed.
To say eleven you simply say 十一 shíyī "ten one". Twelve is 十二 shí'èr. And so on.
Fourty two is 四十二 sìshí'èr "four ten two".
With that you should be able to make all combinations to count from 1 to 99.