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 digits 1-9 only once, create two factors that will result in a product as close to 10,000, without going over. Source: Danielle McNichol

Directions: Using the digits 1 to 9 exactly one time each, place a digit in each box to make the difference as close to 200 as possible. Source: Tara Trifiletti and Jessica Goree

Directions: Use the numbers 1-9 at most once each to make this a true subtraction equation. What is the greatest difference? What is the least difference? Source: Ellen Metzger

Directions: Using the digits 1-9 at most one time each, find the closest sum to 10,000 using two 4-digit addends. Source: Jessica Goree

Directions: Using the digits 1-9 at most one time each, find the closest difference to 200. Source: Jessica Goree

Directions: Using digits -9 to 9 at most one time each, create an inequality that has a solution of x > 2. Source: Sarah Furman

Directions: Using the digits 0 to 9, at most one time each, to make a true equation. Source: Linda Cochran

Directions: Using the digits from 1 – 9, at most one time each, find the measures of the two angles that form supplementary angles where their difference is as large as possible. Source: Debra Schneider

Directions: Using the digits from 0 – 9, at most one time each, find the measures of the two angles forming supplementary angles as close as possible in size. Source: Debra Schneider