Greatest common factor of numbers up to 50 worksheets

What is on this worksheet

Find the greatest common factor (GCF) of each pair of whole numbers up to 50; the solved example lists the factors of both numbers.

• Find the: Greatest common factor (GCF)
• Numbers up to: 50

You can change any of these settings above. Press "New problems" for a fresh set with the same settings, or pick Version A to Z to print different sheets for neighboring desks. The answer key always matches.

About greatest common factor and least common multiple

Each problem names a pair of numbers and asks for their greatest common factor (GCF), their least common multiple (LCM), or a mix of the two. Most pairs share a factor bigger than 1, and a few do not, so students meet the answer 1 as well.

The solved example lists the factors or the multiples so students can see where the answer comes from. For the LCM the numbers stop at 20, so the lists stay short.

Printing

US Letter or A4, portrait: choose your paper size above. Print at 100 percent (actual size). Use "Black and white" for the copier, or "Color" for display pages and mini books.