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GCF Bell Work Practice

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GCF Bell Work Practice

A community center is making identical snack packs using all the supplies. Find the greatest common factor (GCF) to make the largest possible number of equal packs with nothing left over. Show your thinking where space is provided.

Warm-Up: Spot the Shared Factors

A factor divides a number evenly. The GCF is the greatest factor two numbers share.

1.Find the GCF of 12 and 18. List one factor they share before giving the GCF.
2.Find the GCF of 20 and 28.
3.Which number is the GCF of 16 and 24?
  • 2
  • 4
  • 8
  • 12

Build the Biggest Equal Groups

Use the greatest number of groups possible while keeping each group identical.

4.The center has 24 apples and 36 granola bars. What is the greatest number of identical snack packs it can make using all the food? How many apples and granola bars go in each pack?
5.A volunteer says the GCF of 15 and 25 is 10 because 10 is the biggest number in the pair that seems close to both. Is the volunteer correct? Find the GCF and explain briefly.
6.Complete the factor pairs for 18: (1, 18), (2, 9), and (, ).
7.A club has 32 blue beads and 40 yellow beads. Find the greatest number of identical color sets it can make. How many of each color will be in each set?

Factor-Array Puzzle

Each row below shows a factor pair for 24. Use the array to think about ways to arrange 24 tiles into equal rows.

1 row × 24 tiles

2 rows × 12 tiles

3 rows × 8 tiles

4 rows × 6 tiles

8.Which factor pairs of 24 have a smaller factor that is also a factor of 18?
9.Find the GCF of 24 and 18. Use their common factors to explain why your answer is the greatest one.
10.Challenge: Two numbers have a GCF of 7. Which pair could they be: 14 and 35, or 14 and 30? Show a quick check.

2 printable pages

  • GCF Bell Work Practice, page 1 of 2: Warm-Up: Spot the Shared Factors, Build the Biggest Equal Groups

    Page 1

  • GCF Bell Work Practice, page 2 of 2: Factor-Array Puzzle

    Page 2

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