It keeps track of all the numbers. Instead of calculators that only show what you're doing, it'll show what you did. For example, a regular computer calculator doesn't show you what you punch in. After you punch in 463 + 1, the second you press another number, that first number goes away, so you have to get a better calculator, or recalculate.
With a scientific calculator, you get a ride variety of buttons to help with different types of equations, and you have (on most) the ability to go back and check your question, and the ability to manipulate past numbers/signs.
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