There are 7 composite numbers from 10 to 20 (including the boundaries):
10, 12, 14, 15, 16, 18 and 20
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The composite numbers that are between 1 and 20 inclusive are: 4 6 8 9 10 12 14 15 16 18 20 This is a total of eleven composite numbers equal to 20 and below.
The composite numbers between 10 and 20 are 12, 14, 15, 16 and 18.
12,14,15,16, and 18
The composite numbers less than 20 are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
There are eleven of them including 20