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MathsAges 10-12

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 10-12

Lowest common multiple (LCM)

Take your time. Show your thinking.

  1. 1. What is the lowest common multiple (LCM) of 9 and 12?

    9 · 12 · Lowest common multiple (LCM)

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

    24 · 56 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 20 and 50?

    20 · 50 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 16 and 40?

    16 · 40 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 8 and 10?

    8 · 10 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 8 and 12?

    8 · 12 · Lowest common multiple (LCM)

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

    21 · 35 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 18 and 30?

    18 · 30 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 20 and 70?

    20 · 70 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 22 and 33?

    22 · 33 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 55 and 66?

    55 · 66 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 20 and 28?

    20 · 28 · Lowest common multiple (LCM)
12 questions · Seed 104731 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 10-12

Lowest common multiple (LCM)

Answers and reasoning. Review before teaching.

  1. 1. What is the lowest common multiple (LCM) of 9 and 12?

    36

    The highest common factor of 9 and 12 is 3, so LCM = (9 × 12) ÷ 3 = 36.

  2. 2. 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.

  3. 3. What is the lowest common multiple (LCM) of 20 and 50?

    100

    The highest common factor of 20 and 50 is 10, so LCM = (20 × 50) ÷ 10 = 100.

  4. 4. What is the lowest common multiple (LCM) of 16 and 40?

    80

    The highest common factor of 16 and 40 is 8, so LCM = (16 × 40) ÷ 8 = 80.

  5. 5. What is the lowest common multiple (LCM) of 8 and 10?

    40

    The highest common factor of 8 and 10 is 2, so LCM = (8 × 10) ÷ 2 = 40.

  6. 6. What is the lowest common multiple (LCM) of 8 and 12?

    24

    The highest common factor of 8 and 12 is 4, so LCM = (8 × 12) ÷ 4 = 24.

  7. 7. 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.

  8. 8. What is the lowest common multiple (LCM) of 18 and 30?

    90

    The highest common factor of 18 and 30 is 6, so LCM = (18 × 30) ÷ 6 = 90.

  9. 9. What is the lowest common multiple (LCM) of 20 and 70?

    140

    The highest common factor of 20 and 70 is 10, so LCM = (20 × 70) ÷ 10 = 140.

  10. 10. What is the lowest common multiple (LCM) of 22 and 33?

    66

    The highest common factor of 22 and 33 is 11, so LCM = (22 × 33) ÷ 11 = 66.

  11. 11. What is the lowest common multiple (LCM) of 55 and 66?

    330

    The highest common factor of 55 and 66 is 11, so LCM = (55 × 66) ÷ 11 = 330.

  12. 12. What is the lowest common multiple (LCM) of 20 and 28?

    140

    The highest common factor of 20 and 28 is 4, so LCM = (20 × 28) ÷ 4 = 140.

12 questions · Seed 104731 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Lowest common multiple (LCM)

Take your time. Show your thinking.

  1. 1. What is the lowest common multiple (LCM) of 9 and 12?

    9 · 12 · Lowest common multiple (LCM)

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

    24 · 56 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 20 and 50?

    20 · 50 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 16 and 40?

    16 · 40 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 8 and 10?

    8 · 10 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 8 and 12?

    8 · 12 · Lowest common multiple (LCM)

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

    21 · 35 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 18 and 30?

    18 · 30 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 20 and 70?

    20 · 70 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 22 and 33?

    22 · 33 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 55 and 66?

    55 · 66 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 20 and 28?

    20 · 28 · Lowest common multiple (LCM)
12 questions · Seed 104731 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Lowest common multiple (LCM)

Answers and reasoning. Review before teaching.

  1. 1. What is the lowest common multiple (LCM) of 9 and 12?

    36

    The highest common factor of 9 and 12 is 3, so LCM = (9 × 12) ÷ 3 = 36.

  2. 2. 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.

  3. 3. What is the lowest common multiple (LCM) of 20 and 50?

    100

    The highest common factor of 20 and 50 is 10, so LCM = (20 × 50) ÷ 10 = 100.

  4. 4. What is the lowest common multiple (LCM) of 16 and 40?

    80

    The highest common factor of 16 and 40 is 8, so LCM = (16 × 40) ÷ 8 = 80.

  5. 5. What is the lowest common multiple (LCM) of 8 and 10?

    40

    The highest common factor of 8 and 10 is 2, so LCM = (8 × 10) ÷ 2 = 40.

  6. 6. What is the lowest common multiple (LCM) of 8 and 12?

    24

    The highest common factor of 8 and 12 is 4, so LCM = (8 × 12) ÷ 4 = 24.

  7. 7. 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.

  8. 8. What is the lowest common multiple (LCM) of 18 and 30?

    90

    The highest common factor of 18 and 30 is 6, so LCM = (18 × 30) ÷ 6 = 90.

  9. 9. What is the lowest common multiple (LCM) of 20 and 70?

    140

    The highest common factor of 20 and 70 is 10, so LCM = (20 × 70) ÷ 10 = 140.

  10. 10. What is the lowest common multiple (LCM) of 22 and 33?

    66

    The highest common factor of 22 and 33 is 11, so LCM = (22 × 33) ÷ 11 = 66.

  11. 11. What is the lowest common multiple (LCM) of 55 and 66?

    330

    The highest common factor of 55 and 66 is 11, so LCM = (55 × 66) ÷ 11 = 330.

  12. 12. What is the lowest common multiple (LCM) of 20 and 28?

    140

    The highest common factor of 20 and 28 is 4, so LCM = (20 × 28) ÷ 4 = 140.

12 questions · Seed 104731 · Age guidance, not curriculum certification