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