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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 18 and 63?

    18 · 63 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 48 and 84?

    48 · 84 · Lowest common multiple (LCM)

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

    4 · 6 · Lowest common multiple (LCM)

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

    12 · 28 · Lowest common multiple (LCM)

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

    12 · 20 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 50 and 70?

    50 · 70 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 12 and 42?

    12 · 42 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 35 and 42?

    35 · 42 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 27 and 63?

    27 · 63 · Lowest common multiple (LCM)

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

    50 · 60 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 20 and 30?

    20 · 30 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 18 and 45?

    18 · 45 · Lowest common multiple (LCM)
12 questions · Seed 104733 · 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 18 and 63?

    126

    The highest common factor of 18 and 63 is 9, so LCM = (18 × 63) ÷ 9 = 126.

  2. 2. What is the lowest common multiple (LCM) of 48 and 84?

    336

    The highest common factor of 48 and 84 is 12, so LCM = (48 × 84) ÷ 12 = 336.

  3. 3. 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.

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

    84

    The highest common factor of 12 and 28 is 4, so LCM = (12 × 28) ÷ 4 = 84.

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

    60

    The highest common factor of 12 and 20 is 4, so LCM = (12 × 20) ÷ 4 = 60.

  6. 6. What is the lowest common multiple (LCM) of 50 and 70?

    350

    The highest common factor of 50 and 70 is 10, so LCM = (50 × 70) ÷ 10 = 350.

  7. 7. What is the lowest common multiple (LCM) of 12 and 42?

    84

    The highest common factor of 12 and 42 is 6, so LCM = (12 × 42) ÷ 6 = 84.

  8. 8. What is the lowest common multiple (LCM) of 35 and 42?

    210

    The highest common factor of 35 and 42 is 7, so LCM = (35 × 42) ÷ 7 = 210.

  9. 9. What is the lowest common multiple (LCM) of 27 and 63?

    189

    The highest common factor of 27 and 63 is 9, so LCM = (27 × 63) ÷ 9 = 189.

  10. 10. 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.

  11. 11. What is the lowest common multiple (LCM) of 20 and 30?

    60

    The highest common factor of 20 and 30 is 10, so LCM = (20 × 30) ÷ 10 = 60.

  12. 12. What is the lowest common multiple (LCM) of 18 and 45?

    90

    The highest common factor of 18 and 45 is 9, so LCM = (18 × 45) ÷ 9 = 90.

12 questions · Seed 104733 · 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 18 and 63?

    18 · 63 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 48 and 84?

    48 · 84 · Lowest common multiple (LCM)

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

    4 · 6 · Lowest common multiple (LCM)

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

    12 · 28 · Lowest common multiple (LCM)

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

    12 · 20 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 50 and 70?

    50 · 70 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 12 and 42?

    12 · 42 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 35 and 42?

    35 · 42 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 27 and 63?

    27 · 63 · Lowest common multiple (LCM)

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

    50 · 60 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 20 and 30?

    20 · 30 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 18 and 45?

    18 · 45 · Lowest common multiple (LCM)
12 questions · Seed 104733 · 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 18 and 63?

    126

    The highest common factor of 18 and 63 is 9, so LCM = (18 × 63) ÷ 9 = 126.

  2. 2. What is the lowest common multiple (LCM) of 48 and 84?

    336

    The highest common factor of 48 and 84 is 12, so LCM = (48 × 84) ÷ 12 = 336.

  3. 3. 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.

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

    84

    The highest common factor of 12 and 28 is 4, so LCM = (12 × 28) ÷ 4 = 84.

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

    60

    The highest common factor of 12 and 20 is 4, so LCM = (12 × 20) ÷ 4 = 60.

  6. 6. What is the lowest common multiple (LCM) of 50 and 70?

    350

    The highest common factor of 50 and 70 is 10, so LCM = (50 × 70) ÷ 10 = 350.

  7. 7. What is the lowest common multiple (LCM) of 12 and 42?

    84

    The highest common factor of 12 and 42 is 6, so LCM = (12 × 42) ÷ 6 = 84.

  8. 8. What is the lowest common multiple (LCM) of 35 and 42?

    210

    The highest common factor of 35 and 42 is 7, so LCM = (35 × 42) ÷ 7 = 210.

  9. 9. What is the lowest common multiple (LCM) of 27 and 63?

    189

    The highest common factor of 27 and 63 is 9, so LCM = (27 × 63) ÷ 9 = 189.

  10. 10. 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.

  11. 11. What is the lowest common multiple (LCM) of 20 and 30?

    60

    The highest common factor of 20 and 30 is 10, so LCM = (20 × 30) ÷ 10 = 60.

  12. 12. What is the lowest common multiple (LCM) of 18 and 45?

    90

    The highest common factor of 18 and 45 is 9, so LCM = (18 × 45) ÷ 9 = 90.

12 questions · Seed 104733 · Age guidance, not curriculum certification