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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.
In fact, electronic calculators are so widespread now that it's hard to believe they didn't become commonplace until the late 20 th century. Before the invention of the modern calculator, people used some other tools for computation. The abacus, for example, is one ancestor of the calculator.