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Many buildings around the world are made of bricks.
Either
or
Compare the weight or length or volume of the different bricks you and your friends have.
Now suppose you have two bricks the same.
What is the weight or length or volume of the two together?
What about if you have 3, 4, 5, 6, 7 or 8 bricks?
Explore!
What can you find out?