Give the students the opportunity to devise an improvement before suggesting the method illustrated above.
Average radius of a marble.
Lay a marble template on the tissue and try the marble in the different holes until you find the one closest to the size of the marble.
They are often collected both for nostalgia and for their aesthetic colors.
Discuss with the class the difficulties with this method in particular the shape of the marble.
Most templates measure to 16ths of an inch.
Write down the measurement.
This is important when buying and selling marbles as collectors base price on the size.
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Most commonly they are about 13 mm 1 2 in in diameter but they may range from less than 1 mm 1 30 in to over 8 cm 3 in while some art glass marbles for display purposes are over 30 cm 12 in wide.