The development of the mathematical proficiencies of understanding, fluency, problem solving and reasoning are key aims of the Australian Curriculum: Mathematics. Although the mathematics curriculum has changed since its publication 60 Mathematical Investigations was designed to have an emphasis on mathematical processes. This support guide was designed to help users to engage with 60 Mathematical Investigations and facilitate mathematical thinking. The mathematics skills and specific content from the Australian Curriculum have been identified for the investigations. Ten investigations have been expanded into tasks that emphasise mathematical thinking. A sample marking guide and assessment rubric has also been provided. Both 60 Mathematical Investigations and this Support Guide were developed for the Mathematical Association of Western Australia (MAWA).