Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make the product as close to 7,000 as possible. Source: Paolo Tolomeo

Directions: Using the digits 0 to 9, at most one time each, create three different times on the clocks where the span of the times are between 12 noon and 7 pm. How can you make the difference between the times the greatest? closest times together? Source: Jason Kornoely

Directions: Directions: Use the digits 0 to 9, at most one time each, to make a true statement. Source: Brian Errey

Directions: Old Mother Hubbard is baking cookies so her cupboards won’t be bare anymore! She bakes 109 cookies in all. She bakes the cookies on 4 cookie sheets. Each cookie sheet is arranged into equal rows and columns, but not every cookie sheet has the same number of rows and columns. Using digits 0-9, at most once, how might the …

Directions: Using the integers -9 to 9 (excluding 0) at most one time each, fill in the blanks to create two distinct perpendicular lines. Source: Louise Pepper with answers from the students of Kings College Alicante, Spain

Directions: Using the digits 1 to 9 at most once each time, fill the boxes to make the greatest possible product. Source: Marc DeArmond

Directions: Using the digits 1 to 9, at most one time each, fill in the boxes to make a product that equals 800,000,000. Source: Robert Kaplinsky

Directions: Using the digits 0 to 9 at most one time each, fill in the boxes to make the greatest possible product. Source: Robert Kaplinsky

Directions: Using the digits from 1 to 9, at most once, make as many true statements as possible. Source: Rochelle Telfer

Directions: Using the digits 0-9 only once each, create as many true equations as possible. Source: Annie DeAngelo and Maeve O’Connell