Other
Conversions for Weight Measurements
This site allows you to convert weight/mass measurements. For example converting tons to grams. CCSS.Math.Content.3.MD.A.2 Measure and estimate liquid volumes and masses of objects using standard units
Sophia Learning
Sophia: Exact Numbers: Lesson 3
This lesson will define and explain how to identify an exact number. It is 3 of 4 in the series titled "Exact Numbers."
Chem Tutor
Chem Tutor: Conversions Using Dimensional Analysis
Practice problems with answers for converting units with dimensional analysis.