Grade 8

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create a true equation. Source: Jos Bertemes

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to create the largest (or smallest) sum possible. Source: Annie DeAngelo

Directions: Using the numbers 1-9 one time only, fill in the blanks so that the equations are true. Source: Kate Nerdypoo

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create a result with the greatest exponent. Source: Kjersti Oliver

Directions: In triangle ABC, angle ABC is obtuse. Using the digits 1 to 9 at most one time each, place a digit in each box to make angle ACB the smallest possible acute angle. Source: Jay Sydow

Directions: Using the digits 1 through 9 at most one time each, place a digit in each box to create an equation such that the solution is the largest integer possible. Source: Kristen Amaral

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to give this cylinder the maximum volume possible. Source: Kyle Leinweber

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to create a a system of equations with infinitely many solutions. Source: Mike

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to create 3 rational and 2 irrational numbers. Source: Jennifer Kolis

Directions: Using the integers -9 to 9 at most one time each, fill in the boxes to create a system of equations with a solution in Quadrant 2. Source: Robert Kaplinsky