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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 20 and 50?

    20 · 50 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 12 and 16?

    12 · 16 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 10 and 25?

    10 · 25 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 35 and 49?

    35 · 49 · Lowest common multiple (LCM)

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

    18 · 30 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 24 and 40?

    24 · 40 · Lowest common multiple (LCM)

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

    20 · 28 · Lowest common multiple (LCM)

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

    27 · 63 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 30 and 42?

    30 · 42 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 40 and 70?

    40 · 70 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 28 and 49?

    28 · 49 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 4 and 14?

    4 · 14 · Lowest common multiple (LCM)
12 questions · Seed 104734 · 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 20 and 50?

    100

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

  2. 2. What is the lowest common multiple (LCM) of 12 and 16?

    48

    The highest common factor of 12 and 16 is 4, so LCM = (12 × 16) ÷ 4 = 48.

  3. 3. What is the lowest common multiple (LCM) of 10 and 25?

    50

    The highest common factor of 10 and 25 is 5, so LCM = (10 × 25) ÷ 5 = 50.

  4. 4. What is the lowest common multiple (LCM) of 35 and 49?

    245

    The highest common factor of 35 and 49 is 7, so LCM = (35 × 49) ÷ 7 = 245.

  5. 5. 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.

  6. 6. What is the lowest common multiple (LCM) of 24 and 40?

    120

    The highest common factor of 24 and 40 is 8, so LCM = (24 × 40) ÷ 8 = 120.

  7. 7. 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.

  8. 8. 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.

  9. 9. What is the lowest common multiple (LCM) of 30 and 42?

    210

    The highest common factor of 30 and 42 is 6, so LCM = (30 × 42) ÷ 6 = 210.

  10. 10. What is the lowest common multiple (LCM) of 40 and 70?

    280

    The highest common factor of 40 and 70 is 10, so LCM = (40 × 70) ÷ 10 = 280.

  11. 11. What is the lowest common multiple (LCM) of 28 and 49?

    196

    The highest common factor of 28 and 49 is 7, so LCM = (28 × 49) ÷ 7 = 196.

  12. 12. What is the lowest common multiple (LCM) of 4 and 14?

    28

    The highest common factor of 4 and 14 is 2, so LCM = (4 × 14) ÷ 2 = 28.

12 questions · Seed 104734 · 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 20 and 50?

    20 · 50 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 12 and 16?

    12 · 16 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 10 and 25?

    10 · 25 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 35 and 49?

    35 · 49 · Lowest common multiple (LCM)

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

    18 · 30 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 24 and 40?

    24 · 40 · Lowest common multiple (LCM)

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

    20 · 28 · Lowest common multiple (LCM)

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

    27 · 63 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 30 and 42?

    30 · 42 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 40 and 70?

    40 · 70 · Lowest common multiple (LCM)

  11. 11. What is the lowest common multiple (LCM) of 28 and 49?

    28 · 49 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 4 and 14?

    4 · 14 · Lowest common multiple (LCM)
12 questions · Seed 104734 · 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 20 and 50?

    100

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

  2. 2. What is the lowest common multiple (LCM) of 12 and 16?

    48

    The highest common factor of 12 and 16 is 4, so LCM = (12 × 16) ÷ 4 = 48.

  3. 3. What is the lowest common multiple (LCM) of 10 and 25?

    50

    The highest common factor of 10 and 25 is 5, so LCM = (10 × 25) ÷ 5 = 50.

  4. 4. What is the lowest common multiple (LCM) of 35 and 49?

    245

    The highest common factor of 35 and 49 is 7, so LCM = (35 × 49) ÷ 7 = 245.

  5. 5. 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.

  6. 6. What is the lowest common multiple (LCM) of 24 and 40?

    120

    The highest common factor of 24 and 40 is 8, so LCM = (24 × 40) ÷ 8 = 120.

  7. 7. 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.

  8. 8. 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.

  9. 9. What is the lowest common multiple (LCM) of 30 and 42?

    210

    The highest common factor of 30 and 42 is 6, so LCM = (30 × 42) ÷ 6 = 210.

  10. 10. What is the lowest common multiple (LCM) of 40 and 70?

    280

    The highest common factor of 40 and 70 is 10, so LCM = (40 × 70) ÷ 10 = 280.

  11. 11. What is the lowest common multiple (LCM) of 28 and 49?

    196

    The highest common factor of 28 and 49 is 7, so LCM = (28 × 49) ÷ 7 = 196.

  12. 12. What is the lowest common multiple (LCM) of 4 and 14?

    28

    The highest common factor of 4 and 14 is 2, so LCM = (4 × 14) ÷ 2 = 28.

12 questions · Seed 104734 · Age guidance, not curriculum certification