Squaring a two digit number ending with 5
Process
- FRONT first digit (first digit + 1)
- BACK 25
- Join these values together
Examples
Squaring of a 3 digit number
Process
- FRONT-Square the first digit
- BACK Square the last two digits
- MIDDLE 2 x first digit x last two digits
- Add any values carried over
Examples
Proof
2 digit number ending with 5 squared
3 digit number squared
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