Students will practice measuring and drawing angles \(\le 180^\circ\) using a protractor. Then students will learn how to measure and draw angles \(\le 360^\circ.\) Then students will learn how to classify angles as acute, right, obtuse, reflex, straight, and whole. Conclude this lesson by giving your students this challenge.

The MAA lists the challenge as 7.G.B.5, but the challenge has nothing to do with angle relationships, so I've placed the challenge here, as I believe this is the right place for it.

Watch these Khan Academy videos:

Do these Khan Academy exercises:

Next, give your students these challenges:

- Zios and Zepts by NRICH

Six Strips by established1962: Here's the solution:

$$\begin{align} 5 \cdot 2 &= 10 \\ 2 + 9 &= 11 \\ 5 \cdot 5 &= 25 \\ 9 + 9 &= 18 \end{align}$$Conclude by leading this investigation:

Solidarity – Poland, 1981 (addition, logic)

by MathPickle

4.MD.C.6: Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.