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Squaring a 2-digit number ending in 1

  • Take a 2-digit number ending in 1.
  • Subtract 1 from the number.
  • Square the difference.
  • Add the difference twice to its square.
  • Add 1.

Example:    61 x 61

  1. Subtract 1:61 – 1 = 60
  2. Square the difference:60 × 60 = 3600
  3. Add the Difference Twice to its Square:3600 + 60 + 60 = 3720
  4. Add 1:3720 + 1 = 3721
  5. Now you will get!    61 × 61 = 3721

1 Answer

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Best answer

Read The above math tricks!

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