Small practice. Bright discoveries.Explore the free starter collection
worksheetstudio.
Sign in
Back to worksheets
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.

New variationTry interactive challengeBrowse templates
Age band:Ages 10-12Ages 13-15

Choose “Save as PDF” to keep a copy. Use your browser’s paper setting for A4 or Letter.

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 16 and 40?

    16 · 40 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 20 and 50?

    20 · 50 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 22 and 55?

    22 · 55 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 30 and 36?

    30 · 36 · Lowest common multiple (LCM)

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

    25 · 35 · Lowest common multiple (LCM)

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

    33 · 55 · Lowest common multiple (LCM)

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

    18 · 30 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 33 and 77?

    33 · 77 · Lowest common multiple (LCM)

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

    6 · 8 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 18 and 24?

    18 · 24 · Lowest common multiple (LCM)

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

    48 · 60 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 25 and 30?

    25 · 30 · Lowest common multiple (LCM)
12 questions · Seed 63 · 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 16 and 40?

    80

    The highest common factor of 16 and 40 is 8, so LCM = (16 × 40) ÷ 8 = 80.

  2. 2. 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.

  3. 3. What is the lowest common multiple (LCM) of 22 and 55?

    110

    The highest common factor of 22 and 55 is 11, so LCM = (22 × 55) ÷ 11 = 110.

  4. 4. What is the lowest common multiple (LCM) of 30 and 36?

    180

    The highest common factor of 30 and 36 is 6, so LCM = (30 × 36) ÷ 6 = 180.

  5. 5. 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.

  6. 6. 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.

  7. 7. 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.

  8. 8. What is the lowest common multiple (LCM) of 33 and 77?

    231

    The highest common factor of 33 and 77 is 11, so LCM = (33 × 77) ÷ 11 = 231.

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

    24

    The highest common factor of 6 and 8 is 2, so LCM = (6 × 8) ÷ 2 = 24.

  10. 10. What is the lowest common multiple (LCM) of 18 and 24?

    72

    The highest common factor of 18 and 24 is 6, so LCM = (18 × 24) ÷ 6 = 72.

  11. 11. 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.

  12. 12. What is the lowest common multiple (LCM) of 25 and 30?

    150

    The highest common factor of 25 and 30 is 5, so LCM = (25 × 30) ÷ 5 = 150.

12 questions · Seed 63 · 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 16 and 40?

    16 · 40 · Lowest common multiple (LCM)

  2. 2. What is the lowest common multiple (LCM) of 20 and 50?

    20 · 50 · Lowest common multiple (LCM)

  3. 3. What is the lowest common multiple (LCM) of 22 and 55?

    22 · 55 · Lowest common multiple (LCM)

  4. 4. What is the lowest common multiple (LCM) of 30 and 36?

    30 · 36 · Lowest common multiple (LCM)

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

    25 · 35 · Lowest common multiple (LCM)

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

    33 · 55 · Lowest common multiple (LCM)

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

    18 · 30 · Lowest common multiple (LCM)

  8. 8. What is the lowest common multiple (LCM) of 33 and 77?

    33 · 77 · Lowest common multiple (LCM)

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

    6 · 8 · Lowest common multiple (LCM)

  10. 10. What is the lowest common multiple (LCM) of 18 and 24?

    18 · 24 · Lowest common multiple (LCM)

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

    48 · 60 · Lowest common multiple (LCM)

  12. 12. What is the lowest common multiple (LCM) of 25 and 30?

    25 · 30 · Lowest common multiple (LCM)
12 questions · Seed 63 · 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 16 and 40?

    80

    The highest common factor of 16 and 40 is 8, so LCM = (16 × 40) ÷ 8 = 80.

  2. 2. 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.

  3. 3. What is the lowest common multiple (LCM) of 22 and 55?

    110

    The highest common factor of 22 and 55 is 11, so LCM = (22 × 55) ÷ 11 = 110.

  4. 4. What is the lowest common multiple (LCM) of 30 and 36?

    180

    The highest common factor of 30 and 36 is 6, so LCM = (30 × 36) ÷ 6 = 180.

  5. 5. 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.

  6. 6. 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.

  7. 7. 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.

  8. 8. What is the lowest common multiple (LCM) of 33 and 77?

    231

    The highest common factor of 33 and 77 is 11, so LCM = (33 × 77) ÷ 11 = 231.

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

    24

    The highest common factor of 6 and 8 is 2, so LCM = (6 × 8) ÷ 2 = 24.

  10. 10. What is the lowest common multiple (LCM) of 18 and 24?

    72

    The highest common factor of 18 and 24 is 6, so LCM = (18 × 24) ÷ 6 = 72.

  11. 11. 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.

  12. 12. What is the lowest common multiple (LCM) of 25 and 30?

    150

    The highest common factor of 25 and 30 is 5, so LCM = (25 × 30) ÷ 5 = 150.

12 questions · Seed 63 · Age guidance, not curriculum certification