Squaring Numbers Ending in 5

Learning Trick

Squaring Tricks

$(10n+5)2=n(n+1)\times 100+25$ Multiply first digit(s) by next number, append 25.
Example:

$452=(4\times 5)25=2025$

Note: Only for numbers ending in 5.

Formula:

$(10n+5)^2=n(n+1)×100+25$

Example (This won't work): $85^2=7225$

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