Open Middle®
Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to make the greatest possible three-digit number that still rounds (to the nearest hundred) to 500.
Hint
What numbers round (to the nearest hundred) to 500? How can you have a number that is greater than 500 and still round (to the nearest hundred) to 500? When does a number stop rounding down (to the nearest hundred) to 500?
Answer
The greatest possible three-digit number is 549.
Source: Robert Kaplinsky
501
sorry that was a answer for a diffrent problem
My actual answer is 549
I would also add the challenge of having them come up with the smallest number possible, when rounded to nearest hundred, rounds up to 500.