Squares Ending in 5


Give me any 2 digit number that ends in 5, and I’ll square it in my head!
452 = 2025
852 = 7225, etc.

There’s a quick way to do this: if the first digit is N and the second digit is 5, then the last 2 digits of the answer will be 25, and the preceding digits will be N*(N+1).

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One Comment Add yours

  1. mini says:

    its nice to have this trick .this saves a lot of time while doing calculation

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