Grade 5

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box so that each expression is simplified to a different odd number. Source: Molly Rawding

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box make the largest possible sum. Source: Robert Kaplinsky and Ellen Metzger

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make the equation true. Source: Ellen Metzger

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make the equation as close to 9.8 as possible. Source: Nanette Johnson, based on Giselle Garcia’s problem

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make the equation true. Source: Giselle Garcia

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the value of this expression is as large as possible. Challenge: Try to make this expression as close to 30 as possible (for an added challenge, try to make this expression as close to 30 as possible using just the …

Directions: Using the integers 1 to 10, at most one time each, place an integer in each box so that the sum is equal to 1. Source: Joshua Nelson

Directions: Using the digits 1 to 6, at most one time each, place a digit in each box to make the largest (or smallest) number that rounds to 5. Source: Annie Forest

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to create two rectangular prisms so the volume of one rectangular prism is double the volume of the other rectangular prism. Source: Joe Schwartz

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the inequality true. Source: Laura Wagenman