A Single-Significant-Digit Calculus for Semi-Automated Guesstimation

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We describe a single-significant-digit calculus for estimating approximate solutions to guesstimation problems. The calculus is formalised as a collection of proof methods, which are combined into proof plans. These proof methods have been implemented as rewrite rules and successfully evaluated in an interactive system, gort, which forms a customised proof plan for each problem and then executes the plan to obtain a solution.