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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.
1 Root calculation functions. 2  Most scientific calculators offer a key for doing square roots, labeled either SQRT or with a radical sign over an x.. 3  Some calculators offer a key for doing roots other than square roots, labeled with a radical sign showing a y in its bend.