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Chemistry and Physics

Enter very big and very small numbers

Type numbers like 6.022 × 10²³ with the exponent key and read answers shown in scientific notation.

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Scientific notation writes a number as a value between 1 and 10 times a power of ten. 6.022 × 10²³ is far shorter than 602,200,000,000,000,000,000,000.

Do not type "× 10 ^". Use the exponent key instead. It builds the power of ten for you, and it keeps the number as one unit, so it is safe in a longer calculation.

Classic Graphing 84

Start on the main screen: Press 2nd then mode (QUIT) to get back to the home screen. Pressing clear on a menu also backs out of it.

  1. Type 6.022. Then press 2nd and the comma key, which prints a small ᴇ (the exponent key). Type 23.

    6.0222ndEE,23

  2. Multiply by 2 and press enter. The result is shown as 1.2044E24.

    ×2enter

You should see1.2044E24

Classic Graphing 84 key reference

Natural Scientific 991

Start on the main screen: Press MENU, then 1 (Calculate) to return to the main calculation screen. AC clears the line you are on.

  1. Type 6.022, then press the ×10ˣ key and type 23.

    6.022×10ˣ23

  2. Multiply by 2 and press =.

    ×2=

You should see1.2044×10^24

Natural Scientific 991 key reference

RPN Scientific 15

Start on the main screen: There is no menu to leave. Press the back arrow to clear a number you are typing, or CLx (g then back arrow) to clear the X register.

  1. Key in 6.022, press EEX, then key in the exponent 23. Press ENTER to finish the number.

    6.022EEX23ENTER

  2. Key in 2 and press ×. The display switches to scientific notation by itself when the number is too big.

    2×

You should see1.2044 24

RPN Scientific 15 key reference

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