Guides
Plain-English explanations of the topics behind our tools, with worked examples.
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Fractions Made Easy: Add, Subtract, Multiply, Divide and Simplify
Clear rules for adding, subtracting, multiplying and dividing fractions, simplifying with the GCF, and converting decimals to fractions.
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Mean, Median, Mode and Standard Deviation Explained
What mean, median and mode tell you, when to use each, and how standard deviation measures spread — with a step-by-step example.