00 Because 00x00=00 and 00+00=00
44444
The largest 3-digit number - not itself a perfect square - is 999. Calculate its square root, round the answer down, then square the answer again.
123
49
41286-7953 or 41268-7935
44444
The largest 3-digit number - not itself a perfect square - is 999. Calculate its square root, round the answer down, then square the answer again.
Same as you would square any other number - multiply it by itself.
81
731 and 137
32 is the smallest two-digit number that can be multiplied by itself to give a four-digit number. (32x32)=1024
Multipling it by itself is probably the easiest way.
16, which is the square of 4, is a two digit even number.
60x2
"Taking a cube" is the same basic procedure, whether it's a one-digit number, a three digit number, a complex number, a square matrix, or anything else you can multiply. Taking the cube simply means, multiply the number by itself, in such a way that it appears three times as a factor. For example, if your three-digit number is 235, you calculate the cube as 235 x 235 x 235.
81 -- 8+1 = 9 -- square root of 81 = 9
Every square of a 4 digit number has more than four digits.