Question

Which one of these numbers is not like the others?

25,16,49,63,81

Answer 1

its 63 which is not like others ...
you see
25 = 5*5
16 = 4*4
49 = 7*7
81 = 9*9
and ..
63 = 7*9 ....
so from this we got that all the other numbers are perfect squares while 63 is not ..so it is not like the others ...

hope it helps !!!!

Answer 2

63, because all others are perfect squares, or a whole number multiplied by itself is equal to that number
25 = 5 * 5
16 = 4 * 4
49 = 7 * 7
63 = (not a perfect square)
81 = 9 * 9