Divisibility Rules · Number Detective Lab

Test divisibility instantly using digit patterns and rule detectors.

Interactive mathematics

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Number

Divisor

Result

Current evidence

Rule evidence

Visual step

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Divisible means division produces a whole-number quotient with remainder zero.

1 Choose rule2 Inspect digits3 Calculate4 Decide

A divisibility rule is valid only when it agrees with exact division and remainder zero.

Experiment

Number to test

Divisor

Working value

Predict: divisible? 1=yes, 0=no

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