L'opération Manquante (Addition & Soustraction) - One atta Time

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Determine which letter best represents the missing fact from the fact family.

20 + 30 = 50

30 + 20 = 50

50 - 20 = 30

50 - 30 = 20 30 + 50 = 20 50 - 20 = 20 51 - 30 = 21

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