Each group needs:

• two 12-inch rulers (alternatively, provide measuring tapes or meter sticks)
• two 12-in (30 cm) pieces of string
• 1 tennis ball or other round object (orange, apple, etc.)
• 1 pencil
• one 2-in x 2-in (5-cm x 5-cm) square of cardboard or paper
• 1-3 scientific calculators
• Measurement & Conversion Worksheet, one per student