aftrekken-tussen-10-en-20
Voorbeeld:
20-1 = 19 20-2 = 18 20-3 = 17 20-4 = 16 20-5 = 15 20-6 = 14 20-7 = 13 20-8 = 12 20-9 = 11 20-10 = 10 19-1 = 18 19-2 = 17 19-3 = 16 19-4 = 15 19-5 = 14 19-6 = 13 19-7 = 12 19-8 = 11 19-9 = 10 18-1 = 17 18-2 = 16 18-3 = 15 18-4 = 14 18-5 = 13 18-6 = 12 18-7 = 11 18-8 = 10 17-1 = 16 17-2 = 15 17-3 = 14 17-4 = 13 17-5 = 12 17-6 = 11 17-7 = 10 16-1 = 15 16-2 = 14 16-3 = 13 16-4 = 12 16-5 = 11 16-6 = 10 15-1 = 14 15-2 = 13 15-3 = 12 15-4 = 11 15-5 = 10 14-1 = 13 14-2 = 12 14-3 = 11 14-4 = 10 13-1 = 12 13-2 = 11 13-3 = 10 12-1 = 11 12-2 = 10 11-1 = 10
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Teach2000
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