For this 3-D Snowflake pattern you need 6 sheets of 8 1/2"x11" paper cut into exact squares.
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Attach each section to the other with tape, glue or staples until you have a completed 6-sided snowflake ornament. Hole punch one end to hang the ornament using yarn, string or christmas ornament fasteners.
You will find many more fun paper 3-D ornament patterns for children here at Paper Decorations for Children, many ornaments patterned using mathematic, geometric symbols.