What is the units digit?

Number Theory Level 2

169 169 is a perfect square and it has 6 6 as its tens digit.

I'm thinking in a perfect square that has 7 7 as its tens digit. What is the unit digit of this perfect square?


The answer is 6.

Victor Paes Plinio by Victor Paes Plinio , 21, Brazil

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1 solution

Hana Wehbi
Dec 24, 2017

2 4 2 = 576 and 2 6 2 = 676 24^2= 576 \text{ and } 26^2= 676 . The solution is not unique

2 Helpful 0 Interesting 0 Brilliant 0 Confused

The problem aks for the unit digit of the perfect square which is 6. I guess that the problem can be misinterpreted, then I will try to solve it

Victor Paes Plinio - 3 years, 5 months ago

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