Each Think Sheets contains five kinds of mind-stretching problems: a word-study problem, a research problem, a philosophical problem, which requires higher-order thinking skills; a make-and-create problem, which requires students to be inventive, creative and experimental, and a creative-thinking problem, which aims to develop the cognitive skills of fluency, flexibility, originality and elaboration. Students can work individually or in pairs. Gr. 3 to 5