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