Students solve trigonometric equations. In this precalculus lesson, students prove trigonometric identities using the Pythagorean Theorem. They apply the addition formulas for sine and cosine to prove different identities.

Students explore modes for addition.  In this K-2 mathematics lesson, students investigate the four models of addition (counting, sets, number line, and balanced equations) using dominoes.  Students examine the relationship...

Learners define matter, the chemical properties of matter, and the physical properties of matter. They name physical and chemical properties of matter (by classifying using a Tree Map). Students determine the mass, volume, and density of...