Question

what will be the maximum number of digits possible in the sum if we add two 4-digit number

Answer 1

The largest four digit number is 9999, and thus, a maximum value can be obtained by adding 9999 and 9999, and the resultant number will be having the maximum number of digits.

9999+9999=19998

Therefore, the maximum number of digits of the resultant number, when two four-digit numbers are added is 5.