Numbers and hiragana troubles

I haven't been taking a break, I've just been learning numbers and practicing hiragana! I have to say, trying to read things in hiragana currently is extremely frustrating. I only know about half the characters, so I have to guess based on the words I already know, and since my repertoire of words is quite small, my guesses are often terrible. Not that I've been trying to read anything actual, just stuff in my textbook, but I think I'm going to give up for a while on that and wait until I know ALL my hiragana before trying to read.

Of hiragana, I currently know 20 characters, my most recent two being te て and to と.

Japanese numbers are confusing... not only are there two completely different sets of numbers to count from 1 to 10 (one Chinese-based and one Japanese-based), there are two different words for some numbers depending on context within the Chinese-based system. 

0 - zero/rei

1 - ichi

2 - ni

3 - san

4 - yon/shi

5 - go

6 - roku

7 - nana/shichi

8 - hachi

9 - ku/kyuu

10 - juu

To get to 19, you just add numbers to the end of 10: juuichi is 11 (literally ten one), juuni is 12 (ten two) and so on.

You count tens by adding a number in front of 10: nijuu is 20 (literally two ten), and anything above that follows the same pattern as the teens: two ten one, two ten two etc etc. (nijuuichi, nijuuni).

As far as I can tell, this pattern continues all the way to 99. I haven't learned the word for 100 yet... that will be next!