The square numbers that divide exactly into 180 are as follows :-
1² (x 180) = 180
2² (x 45) = 180
3² (x 20) = 180
6² (x 5) = 180. . . . . so 36 being 6² is the largest square number.
However, this result can be obtained from the prime factors of 180 which are :-
2² x 5 x 3² . . . . . . the squared numbers are 2 & 3. So 2x3 = 6 is the largest number that when squared, becoming equal to 36, divides exactly into 180.
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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.
To simplify 64, we need to find the largest perfect square that divides evenly into 64. In this case, the largest perfect square that divides evenly into 64 is 64 itself. Therefore, the simplified form of 64 is 64.
Think of the largest number you can. Then square it. Then square that one. Since numbers don't stop, squares don't stop either.
The smallest integer is 11 but there is no smallest number! 0.11 is a smaller number and will give a perfect square. 0.0011 is smaller still, and 0.000011 even smaller. That sequence is endless!