The sum of the largest 3-digit number and the smallest 4-digit number is _____.
The largest 3-digit number is 999. The smallest 4-digit number is 1000.
Hence, their sum equals 999 +1000 = 1999.
Smallest 5 - digit number exceeds the largest 4 - digit number by _______ .
Subtract the largest 5 digit number from the smallest 4 digit number.