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For the basic practice, draw 2 lines of equal length ( divergent and
convergent pairs are more interesting than parallel pairs for the
beginner).
Measure dots of equal distance on the 2 lines.
Number the dots in light pencil. Each line of the pair will be numbered
in the opposite direction - one ascending and one descending.
Join each pair of matching numbers together with a line. The resulting
series of lines creates a parabolic curve.
Continue by drawing additional lines on either side of the two original
lines. Each new line adds another segment of parabolic curve.
Experiment with color after the the students have mastered the concept.
This is the math principle used in string art.
The important thing that makes the lesson a math lesson is the attention
to correct math terms.
Have you explored ORIGAMI as a math connection?