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'Domino Sets' printed from http://nrich.maths.org/
When you buy a set of 0-6 dominoes they often come in cardboard boxes - and those boxes sometimes don't last very long!
What if you were given lots of dominoes in a bag?
Before you started playing it might be a good idea to find out if you have a full set!
How would you go about it?
How could you be sure?
What if someone gave you some 0-9 dominoes?
How many do you think there would be in a full set?