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- Ten wooden rods varying in length from 10 centimeters (3.5 inches) to 1 meter (39.5 inches). The segments are painted alternately red and blue with the number 1 location being red. The end measurement of each rod is 2 1/2 or 3 cm2
- DIY: Use red and blue construction paper, cardstock, or sticks to make ten strips or prisms varying in length (increasing by 10 cm, starting from 10 cm to 100 cm); or alternately stack red and blue LEGO bricks to form 10 rods with varying length; or
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