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"Rounding and Estimation" icon

Rounding and Estimation

This free, online textbook covers some basic functions of mathematics.  "The main aim of this unit is to help you to do this in a sensible and fruitful way. Using a calculation to solve a problem involves four main stages: Stage 1: working out what calculation you want to do; Stage 2: working out roughly what size of answer to expect from your calculation; Stage 3: carrying out the calculation; Stage 4: interpreting the answer – Does it agree with the rough estimate? Does it make sense in terms of the original problem? This unit focuses on Stages 2 and 4."

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