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Stanley wants to collect 900 sports cards. So far, he has collected 428 baseball cards and 217 football cards.How many more cards does Stanley need to complete his collection?

Respuesta :

Answer:

255 more baseball cards.

Step-by-step explanation:

you add 428 and 217 together and you get 645.  then you subtract 900-645 and you get your answer 255.

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