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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 36?

    24 · 36 · Lowest common multiple (LCM)

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

    9 · 12 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 33 and 55?

    33 · 55 · Lowest common multiple (LCM)

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

    40 · 48 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 6 and 14?

    6 · 14 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 36 and 84?

    36 · 84 · Lowest common multiple (LCM)

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

    40 · 70 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 18 and 63?

    18 · 63 · Lowest common multiple (LCM)

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

    9 · 21 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 15 and 25?

    15 · 25 · Lowest common multiple (LCM)

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

    6 · 21 · Lowest common multiple (LCM)

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

    24 · 40 · Lowest common multiple (LCM)
12 questions · Seed 60 · 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 36?

    72

    The highest common factor of 24 and 36 is 12, so LCM = (24 × 36) ÷ 12 = 72.

  2. 2. 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.

  3. 3. What is the lowest common multiple (LCM) of 33 and 55?

    165

    The highest common factor of 33 and 55 is 11, so LCM = (33 × 55) ÷ 11 = 165.

  4. 4. 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.

  5. 5. What is the lowest common multiple (LCM) of 6 and 14?

    42

    The highest common factor of 6 and 14 is 2, so LCM = (6 × 14) ÷ 2 = 42.

  6. 6. What is the lowest common multiple (LCM) of 36 and 84?

    252

    The highest common factor of 36 and 84 is 12, so LCM = (36 × 84) ÷ 12 = 252.

  7. 7. 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.

  8. 8. 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.

  9. 9. 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.

  10. 10. What is the lowest common multiple (LCM) of 15 and 25?

    75

    The highest common factor of 15 and 25 is 5, so LCM = (15 × 25) ÷ 5 = 75.

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

    42

    The highest common factor of 6 and 21 is 3, so LCM = (6 × 21) ÷ 3 = 42.

  12. 12. 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.

12 questions · Seed 60 · 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 36?

    24 · 36 · Lowest common multiple (LCM)

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

    9 · 12 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 33 and 55?

    33 · 55 · Lowest common multiple (LCM)

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

    40 · 48 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 6 and 14?

    6 · 14 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 36 and 84?

    36 · 84 · Lowest common multiple (LCM)

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

    40 · 70 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 18 and 63?

    18 · 63 · Lowest common multiple (LCM)

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

    9 · 21 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 15 and 25?

    15 · 25 · Lowest common multiple (LCM)

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

    6 · 21 · Lowest common multiple (LCM)

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

    24 · 40 · Lowest common multiple (LCM)
12 questions · Seed 60 · 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 36?

    72

    The highest common factor of 24 and 36 is 12, so LCM = (24 × 36) ÷ 12 = 72.

  2. 2. 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.

  3. 3. What is the lowest common multiple (LCM) of 33 and 55?

    165

    The highest common factor of 33 and 55 is 11, so LCM = (33 × 55) ÷ 11 = 165.

  4. 4. 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.

  5. 5. What is the lowest common multiple (LCM) of 6 and 14?

    42

    The highest common factor of 6 and 14 is 2, so LCM = (6 × 14) ÷ 2 = 42.

  6. 6. What is the lowest common multiple (LCM) of 36 and 84?

    252

    The highest common factor of 36 and 84 is 12, so LCM = (36 × 84) ÷ 12 = 252.

  7. 7. 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.

  8. 8. 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.

  9. 9. 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.

  10. 10. What is the lowest common multiple (LCM) of 15 and 25?

    75

    The highest common factor of 15 and 25 is 5, so LCM = (15 × 25) ÷ 5 = 75.

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

    42

    The highest common factor of 6 and 21 is 3, so LCM = (6 × 21) ÷ 3 = 42.

  12. 12. 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.

12 questions · Seed 60 · Age guidance, not curriculum certification