The Number System

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the smallest possible least common multiple. Source: Howie Hua

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the largest possible greatest common factor. Source: Howie Hua

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to find the quotient closest to 1. Source: Michael Dennis

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box so that the difference is as close to 50 as possible. NOTE: The digits used in the difference can be repeated. Source: Giselle Garica

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box so that the sum is as close to 10 as possible. Source: Giselle Garcia

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the equation true. Source: Shaun Errichiello

Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the equation true. Source: Shaun Errichiello

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

Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make two fractions that have a quotient that is as close to 4/11 as possible. Source: Robert Kaplinsky

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the largest (or smallest) sum. Source: Daniel Luevanos