LCM Questions for Class 5 with Solutions

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For Class 5 students, understanding Least Common Multiple (LCM) is essential for solving advanced problems in fractions, ratios and word problems. Below is a comprehensive worksheet containing LCM questions for Class 5 with solutions to help students practice and master this concept.

I. Basic LCM Problems

Find the LCM of the following pairs of numbers:

  1. 6 and 9
  2. 8 and 12
  3. 10 and 15
  4. 4 and 18
  5. 7 and 14
  6. 2, 5, and 7.
  7. 9, 12, and 15.
  8. 10, 15, and 25.
  9. 8, 16, and 32.
  10. 6, 9, and 24.

II. Multiple Numbers

Find the LCM of the following sets of numbers:

  1. 3, 6, and 9
  2. 5, 10, and 20
  3. 4, 8, and 16
  4. 12, 15, and 18
  5. 7, 21, and 28

III. Word Problems on LCM

  1. Two bells ring every 4 minutes and 6 minutes, respectively. How many minutes later will they ring together again?
  2. A farmer plants two types of crops. One is planted every 8 days and the other every 12 days. If they are planted today, when will they be planted together again?
  3. Riya and Tanya exercise every morning. Riya exercises every 3 days, and Tanya exercises every 5 days. After how many days will they exercise together?
  4. Three traffic lights change after every 15 seconds, 20 seconds, and 30 seconds, respectively. After how many seconds will all three lights change together?
  5. Two runners run around a circular track. One completes a lap in 20 seconds, and the other completes it in 25 seconds. How long will it take for both to meet at the starting point?

lcm questions for class 5 with solutions | LCM Questions for Class 5 with Solutions

Solutions —

I. Basic LCM Problems

  1. 6 and 9 → LCM = 18
  2. 8 and 12 → LCM = 24
  3. 10 and 15 → LCM = 30
  4. 4 and 18 → LCM = 36
  5. 7 and 14 → LCM = 14
  6. Check more LCM solution with LCM calculator.

II. Multiple Numbers

  1. 3, 6, and 9 → LCM = 18
  2. 5, 10, and 20 → LCM = 20
  3. 4, 8, and 16 → LCM = 16
  4. 12, 15, and 18 → LCM = 180
  5. 7, 21, and 28 → LCM = 84

III. Word Problems on LCM

  1. LCM = 12 minutes
  2. LCM = 24 days
  3. LCM = 15 days
  4. LCM = 60 seconds
  5. LCM = 100 seconds

This worksheet provides a blend of basic LCM problems, multi-number calculations, and real-life word problems tailored for Class 5 students. With these LCM questions for Class 5 with solutions, students can practice and strengthen their foundational knowledge effectively.

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