LCM Worksheet for Class 5

LCM Worksheet for Class 5

LCM Worksheet – Class 5 (Least Common Multiple)

Name: ____________________
Class: _______ Date: ___________

A. Find the LCM of the following numbers.

  1. 6 and 8
  2. 12 and 18
  3. 15 and 20
  4. 9 and 14
  5. 16 and 24
  6. 10 and 25
  7. 7 and 21
  8. 11 and 22
  9. 18 and 30
  10. 14 and 28

B. Find the LCM of the following three numbers.

  1. 4, 6, 8
  2. 5, 10, 15
  3. 3, 9, 12
  4. 6, 8, 12
  5. 7, 14, 21
  6. 8, 12, 16
  7. 9, 18, 27
  8. 10, 15, 20
  9. 11, 22, 33
  10. 12, 18, 24

C. Fill in the blanks.

  1. LCM of 3 and 5 is ________.
  2. LCM of 4 and 10 is ________.
  3. LCM of 6 and 9 is ________.
  4. LCM of 8 and 12 is ________.
  5. LCM of 7 and 9 is ________.
  6. LCM of 5 and 15 is ________.
  7. LCM of 10 and 20 is ________.
  8. LCM of 12 and 15 is ________.
  9. LCM of 14 and 21 is ________.
  10. LCM of 16 and 18 is ________.

D. Word Problems.

  1. Two bells ring every 6 minutes and 8 minutes. After how many minutes will they ring together?
  2. Two buses arrive every 10 minutes and 15 minutes. When will they arrive together again?
  3. A light blinks every 12 seconds and another every 18 seconds. When do they blink together?
  4. Two runners take 9 minutes and 12 minutes per lap. When will they meet at the starting point?
  5. Three machines work in cycles of 4, 6, and 8 hours. After how many hours will they work together again?
  6. Two trains leave stations every 20 and 30 minutes. When do they leave together?
  7. A bell rings every 7 seconds and another every 14 seconds. When together?
  8. Two taps fill a tank in 5 and 10 hours. After how long will they fill together?
  9. Two lights flash every 3 and 9 seconds. When will they flash together?
  10. A school bell rings every 45 minutes and another every 60 minutes. When will they ring together?

E. Challenge Section

  1. Find LCM of 18, 24, and 36
  2. Find LCM of 25, 50, and 75
  3. Find LCM of 6, 15, and 20
  4. Find LCM of 8, 14, and 28
  5. Find LCM of 9, 12, and 18
  6. Find LCM of 16, 20, and 24
  7. Find LCM of 11, 22, and 33
  8. Find LCM of 13, 26, and 39
  9. Find LCM of 7, 8, and 9
  10. Find LCM of 10, 12, and 15

Answer Key

A

  1. 24
  2. 36
  3. 60
  4. 126
  5. 48
  6. 50
  7. 21
  8. 22
  9. 90
  10. 28

B

  1. 24
  2. 30
  3. 36
  4. 24
  5. 42
  6. 48
  7. 54
  8. 60
  9. 66
  10. 72

C

  1. 15
  2. 20
  3. 18
  4. 24
  5. 63
  6. 15
  7. 20
  8. 60
  9. 42
  10. 144

D

  1. 24 minutes
  2. 30 minutes
  3. 36 seconds
  4. 36 minutes
  5. 24 hours
  6. 60 minutes
  7. 14 seconds
  8. 10 hours
  9. 9 seconds
  10. 180 minutes (3 hours)

E

  1. 72
  2. 150
  3. 60
  4. 56
  5. 36
  6. 240
  7. 66
  8. 78
  9. 504
  10. 60