These critical thinking activities by Pamela Brock engage students in problem solving activities including guess and check, writing equations, process of elimination, order of operations, comparing numbers, multiplication, basic fractions, place value and finding and comparing volume. The problem solving situations all revolve around the theme of Valentine's Day. It is geared for students in grades 4 - 6. Because some of the problems are more involved, the activity can be used in one sitting or can be broken up and used in more than one sitting. It is especially conducive to group/partner work. Helpful tips and an answer key are included. This work is licensed under a Creative Commons Attribution 3.0 Unported License.