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Q: The sum of the digits of a certain two-digit number equals the square root of the number?

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63

81

81 -- 8+1 = 9 -- square root of 81 = 9

If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.

12

It is another whole number.

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34.

There are several hundred of them. One example, the smallest, is 1039

82

12

12

0.1154

43

36 is twice the product of its digits multiplied. 3 times 6 equals 18, and 18 times 2 equals 36.

40 % as a number equals 0.40. 150.00(0.40) = 60, to the justified number of significant digits, since the number "40" is specified to only two such digits.

A whole number is one without digits after the decimal point therefore no number with a decimal point can equal a whole number which means there is no whole number that equals 0.2.

24 divided by three equals 8 divided by four equals 6 2 plus 4 equals 6

The smallest is 29.

Thirty-six.

2178

Self complimentary codes are codes which after certain number of digits extends itself by taking the compliment of the previous digits.

If the sum of squares of digits of a number equals to the number itself, then that number is called an aram strong number.

9x8x7x6x5x4x3x2x1 or 9! which equals 362880 possible combinations if no digits are repeated

100(943/1048) = 90.0 %, to the justified number of significant digits.