Spoilered to avoid spoiling other people's fun.
Spoiler:
1. 12 Stars on the Flag of the European Union
2. 18 Holes on a Golf Course
3.
4. 7 Harry Potter Books by Joanne Kathleen Rowling
5.
6.
7.
8. 16 Ounces in a Pound
9. 1 Monday, 1 Tuesday, 1 Wednesday, 1 Thursday, 1 Friday, 1 Saturday, and 1 Sunday in a Week
10. 16 Pawns, 4 Knights, 4 Bishops, 4 Rooks, 2 Queens and 2 Kings in a Game of Chess