Click on numbers and functions in Calculator just as you would with a standard calculator.

When you click the add, subtract, multiply, or divide button (in scientific mode also: y^{x}, ^{x}√y, EE and the opened round bracket), a white ring appears around the button to let you know the operation to be carried out. The ring around the opened round bracket will stay until all parentheses expressions are closed.

By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called "Cal Tech", whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add, multiply, subtract, and divide, and its output device was a paper tape.

The first programmable pocket calculator was the HP-65, in 1974; it had a capacity of 100 instructions, and could store and retrieve programs with a built-in magnetic card reader.

The latest Scientific Calculator from Casio, fx-991EX Classwiz is 4 times faster than previous model fx-991ES Plus and has 4 times better resolution for easier viewing. ClassWiz has intuitive user interface and high-performance functions, so ideal for education.

Yes, it is allowed. As per UPSC, All non programmable calculators are allowed.

STEP 1 Display the QR code on the calculator. Press "ON" to power, and then "MODE", "0" STEP 2 Read the QR code with a smartphone or tablet. STEP 3 Authenticity check and manual of ESPLUS will be displayed. Press [CHECK] button to check your calculator authenticity. STEP 4 Click on "Worldwide Education Website" to register your product information.

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