Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.
A worksheet to use when learning how to determine missing angles.
A worksheet to use when learning about supplementary angles.
A worksheet to use when learning about complementary angles.
A whole-class game to reinforce students' understanding of complementary and supplementary angles.
A poster to display when learning about complementary and supplementary angles.