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MathsAges 13-15

Lowest common multiple (LCM)

Find the lowest common multiple (LCM) shared by two whole numbers. Review suitability for your learners before teaching.

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Age band:Ages 10-12Ages 13-15

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Worksheet StudioPractice pack · Ages 13-15

Lowest common multiple (LCM)

Take your time. Show your thinking.

  1. 1. What is the lowest common multiple (LCM) of 9 and 21?

    9 · 21 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 8 and 28?

    8 · 28 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 6 and 15?

    6 · 15 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 22 and 55?

    22 · 55 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 33 and 77?

    33 · 77 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 21 and 35?

    21 · 35 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 60 and 84?

    60 · 84 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 24 and 56?

    24 · 56 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 40 and 48?

    40 · 48 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 45 and 54?

    45 · 54 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 24 and 32?

    24 · 32 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 40 and 50?

    40 · 50 · Lowest common multiple (LCM)
12 questions · Seed 104737 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 13-15

Lowest common multiple (LCM)

Answers and reasoning. Review before teaching.

  1. 1. What is the lowest common multiple (LCM) of 9 and 21?

    63

    The highest common factor of 9 and 21 is 3, so LCM = (9 × 21) ÷ 3 = 63.

  2. 2. What is the lowest common multiple (LCM) of 8 and 28?

    56

    The highest common factor of 8 and 28 is 4, so LCM = (8 × 28) ÷ 4 = 56.

  3. 3. What is the lowest common multiple (LCM) of 6 and 15?

    30

    The highest common factor of 6 and 15 is 3, so LCM = (6 × 15) ÷ 3 = 30.

  4. 4. What is the lowest common multiple (LCM) of 22 and 55?

    110

    The highest common factor of 22 and 55 is 11, so LCM = (22 × 55) ÷ 11 = 110.

  5. 5. What is the lowest common multiple (LCM) of 33 and 77?

    231

    The highest common factor of 33 and 77 is 11, so LCM = (33 × 77) ÷ 11 = 231.

  6. 6. What is the lowest common multiple (LCM) of 21 and 35?

    105

    The highest common factor of 21 and 35 is 7, so LCM = (21 × 35) ÷ 7 = 105.

  7. 7. What is the lowest common multiple (LCM) of 60 and 84?

    420

    The highest common factor of 60 and 84 is 12, so LCM = (60 × 84) ÷ 12 = 420.

  8. 8. What is the lowest common multiple (LCM) of 24 and 56?

    168

    The highest common factor of 24 and 56 is 8, so LCM = (24 × 56) ÷ 8 = 168.

  9. 9. What is the lowest common multiple (LCM) of 40 and 48?

    240

    The highest common factor of 40 and 48 is 8, so LCM = (40 × 48) ÷ 8 = 240.

  10. 10. What is the lowest common multiple (LCM) of 45 and 54?

    270

    The highest common factor of 45 and 54 is 9, so LCM = (45 × 54) ÷ 9 = 270.

  11. 11. What is the lowest common multiple (LCM) of 24 and 32?

    96

    The highest common factor of 24 and 32 is 8, so LCM = (24 × 32) ÷ 8 = 96.

  12. 12. What is the lowest common multiple (LCM) of 40 and 50?

    200

    The highest common factor of 40 and 50 is 10, so LCM = (40 × 50) ÷ 10 = 200.

12 questions · Seed 104737 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 13-15

Lowest common multiple (LCM)

Take your time. Show your thinking.

  1. 1. What is the lowest common multiple (LCM) of 9 and 21?

    9 · 21 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 8 and 28?

    8 · 28 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 6 and 15?

    6 · 15 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 22 and 55?

    22 · 55 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 33 and 77?

    33 · 77 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 21 and 35?

    21 · 35 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 60 and 84?

    60 · 84 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 24 and 56?

    24 · 56 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 40 and 48?

    40 · 48 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 45 and 54?

    45 · 54 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 24 and 32?

    24 · 32 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 40 and 50?

    40 · 50 · Lowest common multiple (LCM)
12 questions · Seed 104737 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 13-15

Lowest common multiple (LCM)

Answers and reasoning. Review before teaching.

  1. 1. What is the lowest common multiple (LCM) of 9 and 21?

    63

    The highest common factor of 9 and 21 is 3, so LCM = (9 × 21) ÷ 3 = 63.

  2. 2. What is the lowest common multiple (LCM) of 8 and 28?

    56

    The highest common factor of 8 and 28 is 4, so LCM = (8 × 28) ÷ 4 = 56.

  3. 3. What is the lowest common multiple (LCM) of 6 and 15?

    30

    The highest common factor of 6 and 15 is 3, so LCM = (6 × 15) ÷ 3 = 30.

  4. 4. What is the lowest common multiple (LCM) of 22 and 55?

    110

    The highest common factor of 22 and 55 is 11, so LCM = (22 × 55) ÷ 11 = 110.

  5. 5. What is the lowest common multiple (LCM) of 33 and 77?

    231

    The highest common factor of 33 and 77 is 11, so LCM = (33 × 77) ÷ 11 = 231.

  6. 6. What is the lowest common multiple (LCM) of 21 and 35?

    105

    The highest common factor of 21 and 35 is 7, so LCM = (21 × 35) ÷ 7 = 105.

  7. 7. What is the lowest common multiple (LCM) of 60 and 84?

    420

    The highest common factor of 60 and 84 is 12, so LCM = (60 × 84) ÷ 12 = 420.

  8. 8. What is the lowest common multiple (LCM) of 24 and 56?

    168

    The highest common factor of 24 and 56 is 8, so LCM = (24 × 56) ÷ 8 = 168.

  9. 9. What is the lowest common multiple (LCM) of 40 and 48?

    240

    The highest common factor of 40 and 48 is 8, so LCM = (40 × 48) ÷ 8 = 240.

  10. 10. What is the lowest common multiple (LCM) of 45 and 54?

    270

    The highest common factor of 45 and 54 is 9, so LCM = (45 × 54) ÷ 9 = 270.

  11. 11. What is the lowest common multiple (LCM) of 24 and 32?

    96

    The highest common factor of 24 and 32 is 8, so LCM = (24 × 32) ÷ 8 = 96.

  12. 12. What is the lowest common multiple (LCM) of 40 and 50?

    200

    The highest common factor of 40 and 50 is 10, so LCM = (40 × 50) ÷ 10 = 200.

12 questions · Seed 104737 · Age guidance, not curriculum certification