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Making the world better, one answer at a time. Calculators help in making technical math problems easy. The three most common types of calculators are handheld calculators, printing calculators, and scientific calculators. Calculators help in making technical math problems easy. The three most common types of calculators are handheld calculators, printing calculators, and scientific calculators.
Scientific Calculator Overview. Most of the best-selling calculators are sold by a few companies: Texas Instruments, Sharp, and HP. Despite this, there is a lot of variety among the top 10 scientific calculators.