Directions: Using the digits 0 to 9, at most one time each, find two numbers that round to 500, and have the greatest possible difference. Source: Michael Wiernicki, Graham Fletcher, and Rachel Nelli.
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Subtraction to Get the Smallest Difference
Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to create the smallest possible difference. Source: Graham Fletcher
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