3 + 3 + 3 + 1 + 11 = 21
The answer is 20. In each addition, the individual digits are added together (1+2+3+5+4 = 15)
To 30 digits, pi equals 3.141592653589793238462643383279.
The sum of the digits in 252 is 2 + 5 + 2 which equals 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.
2
Depends on where you start.
There are several hundred of them. One example, the smallest, is 1039
digits in a zip code
36 is twice the product of its digits multiplied. 3 times 6 equals 18, and 18 times 2 equals 36.
The sum of the snd 49 equals 384
15
In any multiplication problem, it's never enough to know only how many digitsthe factors have. The answer always depends on what the digits are.