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a model for multiplication problems, in which the length and width of a rectangle represents the product.
The 3 dimensional version of a circle is a sphere - a round ball. You can make it out of putty or papier mache.
Technical Competence
be more precise. what in maths. area or length or like pi or something. make it with clay its the easiest or make a diagram with paper.
That G is the indicator of year of manufacture. A stands for 1949, so yours was made in 1955.