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Amy's Dominoes printable sheet

You may like to have a look at Domino Sets before trying this problem.

Amy has a box containing ordinary domino pieces but she does not think it is a complete set.

She has 24 dominoes in her box and there are 125 spots on them altogether.

Which of her domino pieces are missing? How do you know?
 

A pile of dominoes

 

If you do not have any dominoes, you might find our interactive Dominoes Environment useful.