37 + 29 = 66
37 - 29 = 8
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The number is 55+66 = 121
66.
83
11 and 6 11+6 = 17 11*6 = 66
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.