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Check out the Cotter AL Abacus iPhone and iPad app in iTunes. Also available for Android devices!
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Think of the Cotter Abacus compared to a recipe. The first few times the food is made, the recipe is carefully referred to. Then, over time, when the chef becomes more comfortable, they will reference the recipe less often, only checking when they are unsure. Finally, after repeated successes, the recipe card is unneeded.
This analogy can be applied to the Cotter Abacus. Initially, the abacus will be used consistently. Then, over time, it will be only used to verify information. Finally, it will be set aside and no longer needed.