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Square a 2 Digit Number Ending in 5


For this example we will use 25


  • Take the "tens" part of the number (the 2 and add 1)=3
  • Multiply the original "tens" part of the number by the new number (2x3)
  • Take the result (2x3=6) and put 25 behind it. Result the answer 625.

Square of 35

  • Take the "tens" part of the number (the 3 and add 1)=4
  • Multiply the original "tens" part of the number by the new number (3x4)
  • Take the result (3x4=12) and put 25 behind it. Result the answer 1225.

Square of 75

  • Take the "tens" part of the number (the 7 and add 1)=8
  • Multiply the original "tens" part of the number by the new number (7x8)
  • Take the result (7x8=56) and put 25 behind it. Result the answer 5625.

 

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