Problems of the Month provide five different activities addressing a variety of mathematical areas. Each activity focuses on specific math concepts and begin at a Level A (challenging for 2nd to 3rd graders) and build up to a Level E (challenging for HS students). Instructions and student masters are provided for each activity and level. The primary focus of the activities is to encourage problem solving skills. The activities are well-written and provide appropriately leveled challenges. Alignment with Common Core State Standards is provided. Students are expected to discuss and justify their solutions. Although answer keys are not provided, student discussion should lead to appropriate solutions.