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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.
Curta calculator. The Curta is a small, hand-cranked mechanical calculator introduced in 1948. It has an extremely compact design: a small cylinder that fits in the palm of the hand. It can be used to perform addition, subtraction, multiplication, division, and â with more difficulty â square roots and other operations.