Looking for an interactive worksheet to review Sequences and Series? Here is the answer! There are four sheets with four problems each. Each sheet reviews a different topic (explicit, arithmetic series, finite geometric series, and infinite geometric series). The teacher checks the middle circle to see if the answers are correct. They have to answer all four questions, find the sum of those answers, and place it in the circle. If the circle answer is not correct, the students must check their problems to see which one is incorrect.