What Does 21/2 Represent in Mathematics?

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In summary, a power in math is represented by an exponent and is a number that is multiplied by itself a certain number of times. To solve a power, you multiply the base number by itself the number of times indicated by the exponent. The difference between a power and a root is that a root is the inverse operation. Powers are commonly used in real life to represent large numbers, in geometry, finance, and computer programming. In a power, the base number is the number being multiplied by itself, and the exponent indicates how many times it is being multiplied.
  • #1
mikedamike
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Hi,

This is no doubt a real simple question

does 21/2 mean 20.5 or 21

Thanks in advance

Mike
 
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  • #2
mikedamike said:
Hi,

This is no doubt a real simple question

does 21/2 mean 20.5 or 21

Thanks in advance

Mike

It means 20.5 or √2

Why would it mean 21 ?
 
  • #3
Sorry, i was 99.99% sure it was 2^0.5 but it was one of those questions you ask when your brain gets wound up from learning a new equation and then you take a step back and its blindingly obvious. Thanks for reply though.
 
  • #4
1 is NOT the same as 1/2!
 
  • #5


Hi Mike,

The notation 21/2 typically means the square root of 21, which is approximately 4.5825. It does not equal 20.5 or 21. I hope this helps clarify your question.

Best,
 

FAQ: What Does 21/2 Represent in Mathematics?

What is a power in math?

A power in math is a number that is multiplied by itself a certain number of times. It is represented by an exponent, which is a small number written above and to the right of the base number.

How do I solve a power in math?

To solve a power in math, you need to multiply the base number by itself the number of times indicated by the exponent. For example, 23 would be solved as 2 x 2 x 2 = 8.

What is the difference between a power and a root in math?

A power in math is a number multiplied by itself a certain number of times, while a root is the inverse operation, finding the number that, when multiplied by itself a certain number of times, equals the given number. For example, the square root of 9 is 3, because 3 x 3 = 9.

What are some common uses of powers in real life?

Powers are commonly used to represent large numbers, such as in scientific notation. They are also used in geometry to represent the area and volume of shapes and objects. In finance, powers are used to calculate compound interest. Additionally, powers are used in computer programming and data analysis.

How do I know which number is the base and which is the exponent?

In a power, the base number is the number being multiplied by itself, and the exponent indicates how many times it is being multiplied. For example, in 23, 2 is the base and 3 is the exponent.

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