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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 24 and 42?

    24 · 42 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 12 and 15?

    12 · 15 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 25 and 30?

    25 · 30 · Lowest common multiple (LCM)

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

    18 · 30 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 55 and 77?

    55 · 77 · Lowest common multiple (LCM)

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

    22 · 55 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 32 and 56?

    32 · 56 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 50 and 60?

    50 · 60 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 20 and 35?

    20 · 35 · Lowest common multiple (LCM)

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

    6 · 15 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 4 and 6?

    4 · 6 · Lowest common multiple (LCM)

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

    20 · 50 · Lowest common multiple (LCM)
12 questions · Seed 104740 · 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 24 and 42?

    168

    The highest common factor of 24 and 42 is 6, so LCM = (24 × 42) ÷ 6 = 168.

  2. 2. What is the lowest common multiple (LCM) of 12 and 15?

    60

    The highest common factor of 12 and 15 is 3, so LCM = (12 × 15) ÷ 3 = 60.

  3. 3. What is the lowest common multiple (LCM) of 25 and 30?

    150

    The highest common factor of 25 and 30 is 5, so LCM = (25 × 30) ÷ 5 = 150.

  4. 4. 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.

  5. 5. What is the lowest common multiple (LCM) of 55 and 77?

    385

    The highest common factor of 55 and 77 is 11, so LCM = (55 × 77) ÷ 11 = 385.

  6. 6. 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.

  7. 7. What is the lowest common multiple (LCM) of 32 and 56?

    224

    The highest common factor of 32 and 56 is 8, so LCM = (32 × 56) ÷ 8 = 224.

  8. 8. What is the lowest common multiple (LCM) of 50 and 60?

    300

    The highest common factor of 50 and 60 is 10, so LCM = (50 × 60) ÷ 10 = 300.

  9. 9. What is the lowest common multiple (LCM) of 20 and 35?

    140

    The highest common factor of 20 and 35 is 5, so LCM = (20 × 35) ÷ 5 = 140.

  10. 10. 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.

  11. 11. What is the lowest common multiple (LCM) of 4 and 6?

    12

    The highest common factor of 4 and 6 is 2, so LCM = (4 × 6) ÷ 2 = 12.

  12. 12. 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.

12 questions · Seed 104740 · 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 24 and 42?

    24 · 42 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 12 and 15?

    12 · 15 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 25 and 30?

    25 · 30 · Lowest common multiple (LCM)

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

    18 · 30 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 55 and 77?

    55 · 77 · Lowest common multiple (LCM)

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

    22 · 55 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 32 and 56?

    32 · 56 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 50 and 60?

    50 · 60 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 20 and 35?

    20 · 35 · Lowest common multiple (LCM)

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

    6 · 15 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 4 and 6?

    4 · 6 · Lowest common multiple (LCM)

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

    20 · 50 · Lowest common multiple (LCM)
12 questions · Seed 104740 · 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 24 and 42?

    168

    The highest common factor of 24 and 42 is 6, so LCM = (24 × 42) ÷ 6 = 168.

  2. 2. What is the lowest common multiple (LCM) of 12 and 15?

    60

    The highest common factor of 12 and 15 is 3, so LCM = (12 × 15) ÷ 3 = 60.

  3. 3. What is the lowest common multiple (LCM) of 25 and 30?

    150

    The highest common factor of 25 and 30 is 5, so LCM = (25 × 30) ÷ 5 = 150.

  4. 4. 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.

  5. 5. What is the lowest common multiple (LCM) of 55 and 77?

    385

    The highest common factor of 55 and 77 is 11, so LCM = (55 × 77) ÷ 11 = 385.

  6. 6. 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.

  7. 7. What is the lowest common multiple (LCM) of 32 and 56?

    224

    The highest common factor of 32 and 56 is 8, so LCM = (32 × 56) ÷ 8 = 224.

  8. 8. What is the lowest common multiple (LCM) of 50 and 60?

    300

    The highest common factor of 50 and 60 is 10, so LCM = (50 × 60) ÷ 10 = 300.

  9. 9. What is the lowest common multiple (LCM) of 20 and 35?

    140

    The highest common factor of 20 and 35 is 5, so LCM = (20 × 35) ÷ 5 = 140.

  10. 10. 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.

  11. 11. What is the lowest common multiple (LCM) of 4 and 6?

    12

    The highest common factor of 4 and 6 is 2, so LCM = (4 × 6) ÷ 2 = 12.

  12. 12. 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.

12 questions · Seed 104740 · Age guidance, not curriculum certification