Subtracting 9

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• 9 - 9 = 0
• 10 - 9 = 1
• 11 - 9 = 2
• 12 - 9 = 3
• 13 - 9 = 4
• 14 - 9 = 5
• 15 - 9 = 6
• 16 - 9 = 7
• 17 - 9 = 8
• 18 - 9 = 9
• 19 - 9 = 10