Stage: 2 Challenge Level: 
Drawing some pictures or using sticks/counters for legs might help.
Do you have any idea approximately how many Zios and Zepts there might be to make $52$ legs?
You could try choosing a certain number of Zios and a certain number of Zepts, then count their legs. Do you need more legs or fewer to have a total of $52$?
Generalising. Working systematically. Investigations. Multiplication & division. Combinations. Factors and multiples. Addition & subtraction. Interactivities. Divisibility. Trial and improvement.
Published June 2000,January 2009.
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