Problem 5 · 2014 Math Kangaroo
Easy
Number Theory
place-value
What is the difference between the smallest five-digit number and the biggest four-digit number?
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Answer: A — 1
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Hint 1 of 2
Write down the smallest five-digit number and the largest four-digit number.
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Hint 2 of 2
Those two numbers are right next to each other on the number line.
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Approach: name the two numbers and subtract
- The smallest five-digit number is 10000 and the largest four-digit number is 9999.
- These are consecutive whole numbers, so their difference is 1.
Mark:
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