This simple conceptual problem does not require algebraic manipulation, but requires students to articulate the reasoning behind each statement.
In this activity, learners overlap the three primary colors to see how all other colors are made. This activity also explains how color can be explained by the subtraction of colors of light, related to the principles of absorption and reflection of light.
This classroom task is meant to elicit a variety of different methods of solving a quadratic equation (A-REI.4).
In this activity, learners use basic measurements of the Earth and pieces of rock and iron to estimate the mass of the Earth. Learners will calculate mass, volume, and density, convert units, and employ the water displacement method. To calculate an even more accurate estimate of the mass of the Earth, this resource includes optional instructions on how to measure the iron core mass.