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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 55 and 77?

    55 · 77 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 27 and 36?

    27 · 36 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 8 and 20?

    8 · 20 · 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 33 and 55?

    33 · 55 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 8 and 28?

    8 · 28 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 45 and 63?

    45 · 63 · Lowest common multiple (LCM)

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

    12 · 18 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 40 and 56?

    40 · 56 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 10 and 35?

    10 · 35 · Lowest common multiple (LCM)

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

    27 · 63 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 36 and 63?

    36 · 63 · Lowest common multiple (LCM)
12 questions · Seed 47 · 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 55 and 77?

    385

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

  2. 2. What is the lowest common multiple (LCM) of 27 and 36?

    108

    The highest common factor of 27 and 36 is 9, so LCM = (27 × 36) ÷ 9 = 108.

  3. 3. What is the lowest common multiple (LCM) of 8 and 20?

    40

    The highest common factor of 8 and 20 is 4, so LCM = (8 × 20) ÷ 4 = 40.

  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 33 and 55?

    165

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

  6. 6. What is the lowest common multiple (LCM) of 8 and 28?

    56

    The highest common factor of 8 and 28 is 4, so LCM = (8 × 28) ÷ 4 = 56.

  7. 7. What is the lowest common multiple (LCM) of 45 and 63?

    315

    The highest common factor of 45 and 63 is 9, so LCM = (45 × 63) ÷ 9 = 315.

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

    36

    The highest common factor of 12 and 18 is 6, so LCM = (12 × 18) ÷ 6 = 36.

  9. 9. What is the lowest common multiple (LCM) of 40 and 56?

    280

    The highest common factor of 40 and 56 is 8, so LCM = (40 × 56) ÷ 8 = 280.

  10. 10. What is the lowest common multiple (LCM) of 10 and 35?

    70

    The highest common factor of 10 and 35 is 5, so LCM = (10 × 35) ÷ 5 = 70.

  11. 11. 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.

  12. 12. What is the lowest common multiple (LCM) of 36 and 63?

    252

    The highest common factor of 36 and 63 is 9, so LCM = (36 × 63) ÷ 9 = 252.

12 questions · Seed 47 · 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 55 and 77?

    55 · 77 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 27 and 36?

    27 · 36 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 8 and 20?

    8 · 20 · 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 33 and 55?

    33 · 55 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 8 and 28?

    8 · 28 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 45 and 63?

    45 · 63 · Lowest common multiple (LCM)

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

    12 · 18 · Lowest common multiple (LCM)

  9. 9. What is the lowest common multiple (LCM) of 40 and 56?

    40 · 56 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 10 and 35?

    10 · 35 · Lowest common multiple (LCM)

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

    27 · 63 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 36 and 63?

    36 · 63 · Lowest common multiple (LCM)
12 questions · Seed 47 · 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 55 and 77?

    385

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

  2. 2. What is the lowest common multiple (LCM) of 27 and 36?

    108

    The highest common factor of 27 and 36 is 9, so LCM = (27 × 36) ÷ 9 = 108.

  3. 3. What is the lowest common multiple (LCM) of 8 and 20?

    40

    The highest common factor of 8 and 20 is 4, so LCM = (8 × 20) ÷ 4 = 40.

  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 33 and 55?

    165

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

  6. 6. What is the lowest common multiple (LCM) of 8 and 28?

    56

    The highest common factor of 8 and 28 is 4, so LCM = (8 × 28) ÷ 4 = 56.

  7. 7. What is the lowest common multiple (LCM) of 45 and 63?

    315

    The highest common factor of 45 and 63 is 9, so LCM = (45 × 63) ÷ 9 = 315.

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

    36

    The highest common factor of 12 and 18 is 6, so LCM = (12 × 18) ÷ 6 = 36.

  9. 9. What is the lowest common multiple (LCM) of 40 and 56?

    280

    The highest common factor of 40 and 56 is 8, so LCM = (40 × 56) ÷ 8 = 280.

  10. 10. What is the lowest common multiple (LCM) of 10 and 35?

    70

    The highest common factor of 10 and 35 is 5, so LCM = (10 × 35) ÷ 5 = 70.

  11. 11. 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.

  12. 12. What is the lowest common multiple (LCM) of 36 and 63?

    252

    The highest common factor of 36 and 63 is 9, so LCM = (36 × 63) ÷ 9 = 252.

12 questions · Seed 47 · Age guidance, not curriculum certification