To find the digit sum of a number you plus the first 2 numbers together, example:
the number 18, 18 is made up of 2 digits 1 and 8.
If you add the 2 digits together you get a total of 9.
So that is the digit sum of 18.
But if you use a higher number like 66 then the method has a small change.
First if you add the two digits together it becomes 12.
But 12 isn't a single digit sum.
So again the 2 digits have to be added together to make a single digit sum.
1+2=3 so 3 is the single digit sum for the number 66.
The greatest 3-digit number is 999. 9+9+9 = 27 The sum of the greatest 3-digit number is 27.
The units digit of a two digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10.
i am a two digit # my tens digit# is 3 times my ones digit #and the sum of my digit is 12 what am i
"If the units digit and the hundreds digit of the number 513 were reversed..." 315 'find the sum of the original number and the new number." 513+315=828
49
sum
The greatest 3-digit number is 999. 9+9+9 = 27 The sum of the greatest 3-digit number is 27.
The units digit of a two digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10.
There is no seven-digit number that has a sum of 5. The smallest seven-digit number is 1,000,000, which already has a sum greater than 5.
i am a two digit # my tens digit# is 3 times my ones digit #and the sum of my digit is 12 what am i
101117
99999
"If the units digit and the hundreds digit of the number 513 were reversed..." 315 'find the sum of the original number and the new number." 513+315=828
120
300
8 cubed = 512
23