9 +10 = 21
100

21 is America's (federal) minimum age to

Get a gun/Gamble
200

This song was 2nd place to be Best Rock Song of 2010

21 guns

300

Novamber 21, 1921 was when this person became leader of a political party

Adolf Hitler

400

This classic sport requires 21 points to win

Badminton

500

21 is the atomic number of which element

Scandium
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