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Materials 1 Graduated Cylinder (50 mL or 100 mL) - 1 mL increments 1 bivalve shell and 1 univalve shell - must fit in graduated cylinder Science and Engineering Practices in the NGSS 4. Analyzing and Interpreting Data 5. Using Mathematical and Computational Thinking https://www.nextgenscience.org/sites/default/files/Appendix%20F%20%20Science%20and%20Engineering%20Practices%20in%20the%20NGSS%20-%20FINAL%20060513.pdf Common Core Math Standards 1.OA.D.8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.