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

6 + 15 = 21

15 + 6 = 21

21 - 6 = 15

15 + 21 = 6 21 - 15 = 6 21 - 6 = 6 6 + 21 = 15

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Dentro de 100

Dentro de 1000

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