What Does 21/2 Represent in Mathematics?

  • Context: High School 
  • Thread starter Thread starter mikedamike
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Discussion Overview

The discussion revolves around the interpretation of the expression 21/2 in mathematics, specifically whether it represents 20.5 or 21, and includes considerations of its potential meanings in different contexts.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • Mike initially questions whether 21/2 means 20.5 or 21.
  • Another participant suggests that 21/2 could mean 20.5 or √2, questioning why it would mean 21.
  • A later reply expresses uncertainty, indicating that the participant was almost certain it referred to 2^0.5 but acknowledges the confusion that can arise when learning new equations.
  • One participant emphasizes that 1 is not the same as 1/2, implying a distinction in interpretation.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the interpretation of 21/2, with multiple competing views presented regarding its meaning.

Contextual Notes

The discussion reflects varying interpretations of mathematical notation and the potential for confusion in different contexts, but does not resolve these ambiguities.

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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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 ?
 
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.
 
1 is NOT the same as 1/2!
 

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