The correct answer is Calculator.The calculator is the earliest device that qualifies as a digital computer.Compute is a word derived from a calculator.The first computer ever made was to perform the basic numeric calculation.An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics. The first solid-state electronic calculator was created in the early 1960s.Pocket-sized devices became available in the 1970s, especially after the Intel 4004, the first microprocessor, was developed by Intel for the Japanese calculator company Busicom.They later became used commonly within the petroleum industry (oil and gas).Additional InformationA computer keyboard is an input device used to enter characters and functions into the computer system by pressing buttons, or keys. It is the primary device used to enter text. A keyboard typically contains keys for individual letters, numbers, and special characters, as well as keys for specific functions. The standard abacus can be used to perform addition, subtraction, division, and multiplication; the abacus can also be used to extract square roots and cubic roots. The beads are manipulated with either the index finger or the thumb of one hand.The central processing unit (CPU), also called a central processor, main processor, or just processor is the electronic circuitry that executes instructions comprising a computer program.The CPU performs basic arithmetic, logic, controlling, and input/output (I/O) operations specified by the instructions in the program.