A good activity to replace boring like term simplifying.
I get the students to:
1. Complete as homework sheet in lead pencil or black pen
2. I show the 'one answer per pyramid' sheet and students try to fix theirs in a blue pen
3. Then I show the full answers, and students finish correcting in a red pen.
The opportunity to learn from our mistakes and problem solve by knowing the top of the pyramid is an important chance to give students the opportunity to fix small errors.