Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) product. Note: This problem’s difficulty can be adjusted by altering the number of digits (boxes), picking smallest or largest, or by picking either a positive, negative, or both. Source: Robert Kaplinsky

Directions: Using the digits 1 to 6, at most one time each, fill in the boxes to create a true statement with the smallest possible interval: Source: Bryan Anderson

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make each statement true. Source: The Open Middle Elementary Team and Dean Johnstone

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make each statement true. Source: The Open Middle Elementary Team and Dean Johnstone

Directions: Using the digits 1 to 9 at most once each, fill in the boxes to make a true statement. Source: Robert Millett

Directions: Using the digits 0 to 9 at most one time each, fill in the boxes to create a correct sentence: Source: Cecilia Calvo

Directions:  Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) quotient. Source:  Robert Kaplinsky

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) quotient. Note: This problem’s difficulty can be adjusted by altering the number of digits (boxes), picking smallest or largest, or by picking either a positive, negative, or both. Source: Robert Kaplinsky

Directions: Using the digits 1 to 8, at most one time each, fill in the boxes to create the following number types: Source: Bryan Anderson