Memorable Facts (3)

MEMORABLE FACTS:-

• Square root of a positive number are both positive and negative but only the positive number is taken
• 
• Square root of even perfect square is even number.
• square root of odd perfect square is odd number.
• The sum of digits of number(n) =even, then the number of digits of square root is n/2.
• The sum of numbers(n) of digit of any number is odd, then number of digits of square root is (n+1)/2.
• The unit place digit of any perfect square cannot be 2, 3, 7 or 8.
• Cube of even positive integer is even.
• Cube of positive  integer is positive number.
• Cube of negative integer is negative number.
• Cube of odd positive integer is odd.