Keep your students engaged with the circuit format! This circuit contains 16 factoring by grouping problems suitable for algebra one or algebra two or even college algebra. Students must factor and then hunt for ONE of their factors to advance in the circuit. The expressions get progressively more difficult, so it is great for differentiated instruction. There are a few much more rigorous ones towards the end! The format motivates students to practice and it also requires them to ask questions when they get stuck. My students lean over and help each other effortlessly when they are working in the circuit format.
The answer key is not included because it is embedded in the circuit. The only thing the teacher must do is work the circuit ahead of time. The circuit and the students take care of the rest!