What this calculator does
Model a common groups-times-items-plus-extra word problem.
How it works
The calculator evaluates total = groups × items per group + extra items. Inputs are checked before calculation, and invalid values such as zero denominators or out-of-range selections produce a clear error instead of a misleading result.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
3-
?groups=Number of groupsNumber · Required · Default: 8
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?itemsPerGroup=Items per groupNumber · Required · Default: 12
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?extraItems=Extra items addedNumber · Required · Default: 5
Outputs
3-
totalTotal itemsNumber · Primary output
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equationEquationText
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multiplicationSubtotalGroups subtotalNumber
Inputs and results
The inputs are Number of groups, Items per group, Extra items added. Results include Total items, Equation, Groups subtotal.