Ah. Kanji is so hard, I don't think I'll be able to teach you this properly. So instead, I'll teach you japanese numbers :)

NUMBER-CHARACTER-ENGLISH

1  一 ONE (ichi)

2  二 TWO (ni)

3  三 THREE (san)

4  四 FOUR (shi/yon)

5  五 FIVE (go)

6  六 SIX (roku)

7  七 SEVEN (nana/shichi)

8  八 EIGHT (hachi)

9  九 NINE (kyū/ku)

10  十 TEN (jyū)

11  十一 ELEVEN (jū ichi)

12  十二 TWELVE (jū ni)

13  十三 THIRTEEN (jū san)

14  十四 FOURTEEN (jū yon)

15  十五 FIFTEEN (jū go)

16  十六 SIXTEEN (jū roku)

17  十七 SEVENTEEN (jū nana)

18  十八 EIGHTEEN (jū hachi)

19  十九 NINETEEN (jū kyū)

20  二十 TWENTY (ni-jū)

100  百 ONE HUNDRED (hyaku)

1000  千 ONE THOUSAND (sen)

So pretty much, I've guess you've seen the pattern on twenty right? You just have to add 'ichi' to make it twenty one and so on.

So that's pretty much all.

So if you have questions, don't hesitate to comment :)