Greatest common factor, least common multiple

Answer Key - Grade 6 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Bo reads a puzzle card. Factors of 15: 1, 3, 5, 15. Factors of 20: 1, 2, 4, 5, 10, 20. What is the greatest common factor of 15 and 20?

   5
2. 2.

   Esme copies a clue from the board. Factors of 16: 1, 2, 4, 8, 16. Factors of 20: 1, 2, 4, 5, 10, 20. What is the greatest common factor of 16 and 20?

   4
3. 3.

   Luz solves a number puzzle. Multiples of 3: 3, 6, 9, 12, 15. Multiples of 4: 4, 8, 12, 16. What is the least common multiple of 3 and 4?

   12
4. 4.

   Noah follows a map clue. What is the greatest common factor of 12 and 18?

   6
5. 5.

   Pia reads a puzzle card. What is the greatest common factor of 8 and 20?

   4
6. 6.

   Ren copies a clue from the board. What is the greatest common factor of 24 and 16?

   8
7. 7.

   Zee finds a hint in a book. What is the least common multiple of 6 and 10?

   30
8. 8.

   Bo solves a number puzzle. What is the least common multiple of 5 and 6?

   30
9. 9.

   Kira sets up the art tables with 18 red pens and 27 blue pens. Each table gets the same number of each color, with none left over. What is the greatest number of tables?

   9
10. 10.

    Paper plates come in packs of 6 and paper cups in packs of 8. Milo wants the same number of plates and cups. What is the least number of plates Milo can buy?

    24