What does a Primary 1 student do when she has
mastered the Knobbed Cylinders?  She
brings all the four blocks of Knobbed Cylinders out, empties them and tries to
fit them all together at once.  This is
her own interesting extension of the Knobbed Cylinders material.

What does a Primary 1 student do when she has mastered the Knobbed Cylinders?  She brings all the four blocks of Knobbed Cylinders out, empties them and tries to fit them all together at once.  This is her own interesting extension of the Knobbed Cylinders material.

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