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The units digit of a perfect square is 6. What are the possible values of the tens digit?
I know the answer is 1,3,5,7,9 but I need to be able to prove it

 Aug 4, 2021
 #1
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If the units digit of a perfect square is 6 then it will always be odd.

You can provide many examples

16

36

196
256

576

676

1156

1296

 

Yay!

 Aug 5, 2021
 #2
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0

Tens digit, sorry, my mistake

Varxaax  Aug 13, 2021

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