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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 15 and 20?

    15 · 20 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 25 and 35?

    25 · 35 · Lowest common multiple (LCM)

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

    27 · 63 · Lowest common multiple (LCM)

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

    12 · 42 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 44 and 77?

    44 · 77 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 15 and 21?

    15 · 21 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 4 and 10?

    4 · 10 · 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 10 and 25?

    10 · 25 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 48 and 60?

    48 · 60 · Lowest common multiple (LCM)

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

    33 · 55 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 24 and 36?

    24 · 36 · Lowest common multiple (LCM)
12 questions · Seed 104742 · 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 15 and 20?

    60

    The highest common factor of 15 and 20 is 5, so LCM = (15 × 20) ÷ 5 = 60.

  2. 2. What is the lowest common multiple (LCM) of 25 and 35?

    175

    The highest common factor of 25 and 35 is 5, so LCM = (25 × 35) ÷ 5 = 175.

  3. 3. 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.

  4. 4. 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.

  5. 5. What is the lowest common multiple (LCM) of 44 and 77?

    308

    The highest common factor of 44 and 77 is 11, so LCM = (44 × 77) ÷ 11 = 308.

  6. 6. What is the lowest common multiple (LCM) of 15 and 21?

    105

    The highest common factor of 15 and 21 is 3, so LCM = (15 × 21) ÷ 3 = 105.

  7. 7. What is the lowest common multiple (LCM) of 4 and 10?

    20

    The highest common factor of 4 and 10 is 2, so LCM = (4 × 10) ÷ 2 = 20.

  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 10 and 25?

    50

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

  10. 10. What is the lowest common multiple (LCM) of 48 and 60?

    240

    The highest common factor of 48 and 60 is 12, so LCM = (48 × 60) ÷ 12 = 240.

  11. 11. 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.

  12. 12. 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.

12 questions · Seed 104742 · 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 15 and 20?

    15 · 20 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 25 and 35?

    25 · 35 · Lowest common multiple (LCM)

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

    27 · 63 · Lowest common multiple (LCM)

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

    12 · 42 · Lowest common multiple (LCM)

  5. 5. What is the lowest common multiple (LCM) of 44 and 77?

    44 · 77 · Lowest common multiple (LCM)

  6. 6. What is the lowest common multiple (LCM) of 15 and 21?

    15 · 21 · Lowest common multiple (LCM)

  7. 7. What is the lowest common multiple (LCM) of 4 and 10?

    4 · 10 · 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 10 and 25?

    10 · 25 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 48 and 60?

    48 · 60 · Lowest common multiple (LCM)

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

    33 · 55 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 24 and 36?

    24 · 36 · Lowest common multiple (LCM)
12 questions · Seed 104742 · 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 15 and 20?

    60

    The highest common factor of 15 and 20 is 5, so LCM = (15 × 20) ÷ 5 = 60.

  2. 2. What is the lowest common multiple (LCM) of 25 and 35?

    175

    The highest common factor of 25 and 35 is 5, so LCM = (25 × 35) ÷ 5 = 175.

  3. 3. 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.

  4. 4. 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.

  5. 5. What is the lowest common multiple (LCM) of 44 and 77?

    308

    The highest common factor of 44 and 77 is 11, so LCM = (44 × 77) ÷ 11 = 308.

  6. 6. What is the lowest common multiple (LCM) of 15 and 21?

    105

    The highest common factor of 15 and 21 is 3, so LCM = (15 × 21) ÷ 3 = 105.

  7. 7. What is the lowest common multiple (LCM) of 4 and 10?

    20

    The highest common factor of 4 and 10 is 2, so LCM = (4 × 10) ÷ 2 = 20.

  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 10 and 25?

    50

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

  10. 10. What is the lowest common multiple (LCM) of 48 and 60?

    240

    The highest common factor of 48 and 60 is 12, so LCM = (48 × 60) ÷ 12 = 240.

  11. 11. 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.

  12. 12. 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.

12 questions · Seed 104742 · Age guidance, not curriculum certification