The Number System

Directions: Use the digits 0 through 9, without repeats, to solve the problem below. Source: Shaun Errichiello

Directions: Use the digits 0 to 9, at most one time each, to fill in the boxes and make a true statement. Source: Wendy Taylor

Directions: Use the digits 1 to 9, at most one time each, to fill in the boxes 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

Directions: Using Integers 2 to 9 (without repeating any number), fill in the boxes to create: Source: Bryan Anderson

Directions: Using the digits 0 to 9 at most one time each, fill in the blanks to create a quadrilateral with an area of 16 square units. Source: Daniel Luevanos

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make three decimals whose sum is as close to 1 as possible. Source: Robert Kaplinsky

Directions: Make four points using the integers -4 to 4 at most one time each so that each point is in a different quadrant. Source: Robert Kaplinsky

Directions: Using the digits 0 to 9 at most one time each, fill in the boxes to create at least two different examples where the quotient is undefined. Source: Daniel Luevanos

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) sum. Note: This problem’s difficulty can be adjusted by altering the number of digits (boxes), picking smallest or largest, or by picking either a positive, negative, or both. Source: Robert Kaplinsky