The Number System

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: Using the digits 1 to 9 at most one time each, place a digit in each box to find the second greatest solution. Source: Neil Hamilton

Directions: Using the integers -9 to 9 at most one time each, fill in the boxes to create a quotient with the greatest possible value. Source: Robert Kaplinsky

Directions: Using the integers -9 to 9 at most one time each, fill in the boxes to create two equations. You may reuse all the integers for each equation. Source: Robert Kaplinsky

Directions: Using the integers -9 to 9 at most one time each, fill in the boxes to create an equation where each side has the greatest possible value. Source: Robert Kaplinsky

Directions: Using the integers -9 to 9 at most one time each, fill in the boxes to create two equations. You may reuse all the integers for each equation. Source: Robert Kaplinsky

Directions: Using the integers -9 to 9 at most one time each, place an integer in each box to make the greatest possible product. Source: Robert Kaplinsky in Open Middle Math

Directions: Using the integers -9 to 9 at most one time each, place an integer in each box to make two products: one where the product is positive and one where the product is negative. You may reuse all the integers for each product. Source: Robert Kaplinsky in Open Middle Math

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