Directions: Using the digits 1 to 9 at most one time each, place a digit in each box create a true statement. Source: Dana Harrington

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box create a true statement. Source: Dana Harrington

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to create three different linear equations whose y-intercepts have integer values. Source: Michelle Kovesi and Harold Jacobs

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to find the largest/smallest possible sum of the three terms in this finite geometric series. Source: Dana Harrington

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to find the largest or smallest possible coefficient of the third term in the expansion. Source: Dana Harrington

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create a right triangle where 𝜃 is as close to 10° as possible. Source: Thomas Derstein

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to create a correct sentence: The vertex of the parabola, y = ▢ x² + ▢ x + ▢, lies on the horizontal axis Source: Cecilia Calvo

Directions: Use only the digits 1-9, each digit only once, to create a problem that has the smallest possible positive answer. Source: Noel Chang

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to make the statement true. Source: Cassie Winchell

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to make the statement true. Source: Cassie Winchell