Directions: Use only the digits 1 to 7, at most one time each, fill in the boxes to create a true statement. Source: Eric Appleton

Directions: Use the operation symbols (+, -, x, and ÷) to make the equation true. Operations may be used more than once. Source: Joshua Nelson

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

Directions: Use the digits 1 to 9, at most one time each, place a digit in each box on the number line to make the number line true. NOTE: number line not drawn to scale Source: Amanda Dey

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box 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, Answer by Joseph Nguyen

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, fill in the boxes to make a true statement. Source: Owen Kaplinsky

Directions: Using the digits 1 to 7, at most one time each, place a digit in each circle so that the sum of the numbers in 3 squares (the middle horizontal line or 2 diagonals) are same. e.g A+B+C or D+B+E or F+B+G Is there more than one solution? Source: Al Oz

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