find the smallest number that can be added to 100 to make it a perfect cube

• it's simply 25.
  100+25=125 i.e (5)^3
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• 25
  125=5*5*5
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• perfect cube near 100 is 125=5*5*5. hence 25 must be added to 100 to make it a perfect cube
  
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• answer 25
  4*4*4=64
  5*5*5=125
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