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