15
fifteen (10+5)
20
twenty (10+10)
18
eighteen (10+8)
12
twelve (10 + 2)
10
ten (10+0)
17
seventeen (10+7)
13
thirteen (10+3)
14
fourteen (10+4)
16
sixteen (10+6)
11
eleven (10 +1)
19
nineteen (10+9)