Khan Academy Static

Determining_precision_in_descriptive_modeling

This tutorial discusses the delicate relationship between descriptive mathematics (which can be very precise) and the real world it describes (which usually isn't precise at all).

Dimensional_analysis_for_proportional_reasoning

In middle school we learn how to solve proportion problems using proportional reasoning. In this tutorial you will learn how to solve those problems using dimensional analysis.

Modeling_with_one_variable_equations_inequalities

Learn how to determine the appropriate *type* of modeling equation (or inequality) according to the description of a real-world context.

Dimensional_analysis_for_converting

Practice solving word problems that involve the conversion between different units for the same quantity. For example, a rate problem where some rates are in km/h and some are in m/s.

Intro_to_dimensional_analysis

Learn how to work with units that are arithmetic combinations of more simple units. For example, velocity units are quotients of distance units over time units, which corresponds to the formula v=d/t.

Word_problems_with_multiple_units

Practice solving word problems that involve a variety of units.

Manipulating_formulas

Learn how to solve problems that involve multi-variable formulas.