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Start with the number 1 in the smaller top left triangle on the fortune teller. Write the numbers in ascending order clockwise around the triangles. End with the number 8 in the last triangle on the left side of the fortune teller. Each of the smaller triangles will be on half of a larger triangle. If you want to separate them, draw a line along the crease between them.

Summary:
Put numbers in ascending order on the triangles.