Reasoning in number and operations -- Reasoning about sums of consecutive numbers -- Reasoning about factors and multiples -- Reasoning in measurement -- Reasoning about area formulas -- Reasoning in geometry -- Reasoning about similar figures -- Reasoning in data analysis -- Reasoning about data to make decisions -- Reasoning about the mean and median of a distribution -- Reasoning in algebra -- Reasoning about growth and change in patterns -- Reasoning and proof, levels 1-3 -- Reasoning about the pythagorean theorem -- Looking back and looking ahead.