LET'S COUNT TO TWENTY.

1 -> ONE

2 -> TWO

3 -> THREE

4 -> FOUR

5 -> FIVE

6 -> SIX

7 -> SEVEN

8 -> EIGHT

9 -> NINE

10 -> TEN

11 -> ELEVEN

12 -> TWELVE

13 -> THIRTEEN

14 -> FOURTEEN

15 -> FIFTEEN

16 -> SIXTEEN

17 -> SEVENTEEN

18 -> EIGHTEEN

19 -> NINETEEN

20 -> TWENTY