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