Find the difference between the largest 7-digit number and the smallest 8-digit number.
1
Idea: The largest 7-digit number has all digits 9. The smallest 8-digit number is 1 followed by seven 0s.
Step 1: Write the largest 7-digit number.
\(\text{Largest 7-digit number} = 9,999,999\)
Step 2: Write the smallest 8-digit number.
\(\text{Smallest 8-digit number} = 10,000,000\)
Step 3: Find the difference.
\(\text{Difference} = 10,000,000 - 9,999,999\)
\(= 1\)
Conclusion: The difference is \(1\).