Sometimes quiz need calculator

Question

During challenge, mathematic question occured like 25*25
who can calculate it without calculator and on 10 sec ;)

Answer 1

I agree with you. The community needs to learn to downvote suggested quizzes that take too much time to calculate.
The only way to get the correct answer sometimes it's by remembering the answer from previous tries

Answer 2

do not forget the result it's 625 :)