Directions: Using the digits 1 to 9, at most one time each, fill in the boxes to make a true statement. Source: Owen Kaplinsky

Directions: Using the digits 0 to 9, at most one time each, fill in the boxes to create two numbers that both round to 5 and have the greatest (or least) possible difference with 5. Each digit may only be used once. Source: Mike Wiernicki

Directions: Using the digits 0 through 9, without repeating any digits, find the quotient closest to 1. Source: Michael Dennis

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make a whole number product. Source: Owen Kaplinsky

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make a true statement. Source: Owen Kaplinsky

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make a true statement. Source: Owen Kaplinsky

Directions: Use the digits 1 to 9, at most one time each, to make a difference with the least possible value. Source: Owen Kaplinsky and Robert Kaplinsky

Directions: Use the digits 1 to 9, at most one time each, to make a sum with the greatest possible value. Source: Owen Kaplinsky and Robert Kaplinsky

Directions: Use the digits 1 to 9, at most one time each, to make two true statements. Source: Owen Kaplinsky

Directions: Use the digits 1 to 9, at most one time each, to make two true statements. Source: Owen Kaplinsky