Khan Academy
Khan Academy: Density Word Problems
Solve problems concerning real-world situations using your knowledge of volume, surface area, and density. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
OpenStax
Open Stax: Physics: Approximation
On many occasions, physicists, other scientists, and engineers need to make approximations or "guesstimates" for a particular quantity. What is the distance to a certain destination? What is the approximate density of a given item? About...
CK-12 Foundation
Ck 12: Pressure in Fluids
[Free Registration/Login may be required to access all resource tools.] Students will develop an understanding of density and pressure, and how to solve problems involving them.