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 to 9 at most one time each, fill in the boxes to make the difference equal to 39. Source: Chris Ignaciuk

Directions: Use the digits 1 to 9, at most one time each, to make a difference with the least possible value. Source: Owen Kaplinsky and Robert Kaplinsky

Directions: Use the digits 1 to 9, at most one time each, to make two true statements. Source: Owen Kaplinsky

Directions: Fill in the boxes so that you would need to regroup when you subtract. Make sure that your number is less than 63. Extension: Explain why you need to regroup using your number. Source: Chase Orton

Directions: Using the digits 1 to 9, at most one time each, fill in the boxes so that you would not need to regroup when you subtract. Make sure your number is less than 63. Extension: Explain why you do NOT need to regroup using your number. Source: Chase Orton

Directions: Using the digits 1 to 9, at most one time each, fill the boxes below to create the smallest possible difference. Source: Graham Fletcher

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 0 to 9 at most one time each and choosing either multiplication/division or addition/subtraction, place a digit in each box to make a true statement. Source: Brian Errey

Directions: Directions: Use the digits 0 to 9, at most one time each, to make a true statement. Source: Brian Errey