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