Calculator
Fingers
Abacus
Pencil and paper
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a model.
if you mean kohls the department store the cashiers use math when you buy something and they add up the prices and that equals the price u pay
you could use a bobby pin a paper clip or maybe he key... lol :]
You can use an abacus to add and subtract quantities of beads by moving the them around. This can in turn help to solve equations involving counting numbers.
A Decision-making grid.