GCF: Crack the Code

Give your students practice finding the greatest common factor (GCF) with this fun code-breaking worksheet! Designed for sixth-grade learners, this worksheet challenges students to find the GCF of 10 problems and use the solutions to crack the code at the bottom of the page. Students will gain practice finding the GCF of two whole numbers that are both less than or equal to 100, before progressing to finding the GCF of three whole numbers. For more practice finding the greatest common factor, check out the Practice Finding the Greatest Common Factor worksheet.