16. Squaring Decimal Numbers : Ex: (1.2)² Ex: (2.35)² Ex 3: (0.07)²

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Shortcut for Squaring Decimal Numbers

 To square a decimal number:

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  Ignore the decimal and square the number as an integer.

  
  


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  Count the decimal places in the original number.

  
  


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  The final answer should have double the decimal places.

  
  

Ex: (1.2)²

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  Ignore decimal: 12²=144

  
  


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  1 decimal place → Answer must have 2 decimal places

  
  


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  Ans: 1.44

  
  

Ex: (2.35)²

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  Ignore decimal: 235²=55225

  
  


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  2 decimal places → Answer must have 4 decimal places

  
  


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  Ans: 5.5225

  
  

Ex 3: (0.07)²

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  Ignore decimal: 7²=49

  
  


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  2 decimal places → Answer must have 4 decimal places

  
  


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  Ans: 0.0049

  
  

This method works for all decimal numbers.