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Amy's Dominoes

Age 7 to 11 Challenge Level:

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?
 

 

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