LCM of 3 Numbers

Q. Three lights flash at intervals of 5, 8 and 10 seconds respectively.

If they are all switched on at the same time, how soon after will they flash together again?

1. 40 seconds
2. 60 seconds
3. 20 seconds
4. 80 seconds

Q. What is the smallest common multiple of 4, 6 and 5?

1. 24
2. 20
3. 30
4. 60

Q. Enter the LCM of the numbers 5, 6, and 12.

1. 60

Q. What is the least common multiple of 10, 20 and 30?

1. 10
2. 30
3. 60
4. 120

Q. How many numbers less than 100 are common multiples of 8 and 9?

Q.

Find all the numbers less than $100$ which are multiples of $4$ and $5$.

Q. What is the least common multiple of 5, 6 and 10?

1. 15
2. 30
3. 60
4. 24

Q. The least common multiple of 9, 18, 57 and 12 is _____.

1. 114
2. 36
3. 684
4. 228

Q. What is the least common multiple of 2, 13, 26 ?

1. 2
2. 13
3. 26
4. 52

Q.

What is the greatest common divisor of $1665,4554,1683,$ and $4050$?

Q. The least common multiple of 9, 18, and 12 is _____.

1. 24
2. 27
3. 36
4. 40

Q. Today, the cricket team, the soccer team and the basketball team, all had games. The cricket team plays every 2nd day, the soccer team plays every 3rd day and the basketball team plays every 5th day. On which of the following day from today, will all the teams have games on the same day again?

1. ${18}^{th}$
2. ${10}^{th}$
3. ${30}^{th}$
4. ${15}^{th}$

Q. Putting the multiples of 4, 6 and 5 in the circles.

• What common multiples of 5 and 6 did you write in the green part?
• What common multiples of 4 and 6 are written in the orange part?
• In which coloured part did you write the common multiples of 4, 6 and 5?
• What is the smallest common multiple of 4, 6 and 5? ________

Q. The largest one digit multiple of 4 is:

1. 4
2. 1
3. 8
4. 9

Q.

Rashmi goes to shopping mall once in every $8$ days, gym class once in every $3$ days and the temple once in every $12$ days. If she last went to all the three places on $5^{\text{th}}$ of June, when will she next attend them together?

1. ${10}^{\text{th}}$ July
2. $7^{\text{th}}$ July
3. ${29}^{\text{th}}$ June
4. ${27}^{\text{th}}$ June

Q. Find the Least Common multiple of 4, 6 and 8

Q. Minie goes to shopping every 5 days and she does gandening every 6 days. If she did both of them today, after how many days she will do both gardening and shopping?

Q. Manshi goes to dance class once after every 3 days, karate class once after every 5 days and art class once after every 6 days.

If she last attended all the three classes on $1^{\text{st}}$ of April, when will she next attend them together?

1. $8^{\text{th}}$ April
2. $7^{\text{th}}$ May
3. $1^{\text{st}}$ May
4. $6^{\text{th}}$ May

Q. Manshi goes to dance class once in every 6 days, karate class once in every 12 days and art class once in every 18 days.

If she last attended all the three classes on $1^{\text{st}}$ of April, when will she next attend them together?

1. $6^{\text{th}}$ May
2. $7^{\text{th}}$ May
3. ${10}^{\text{th}}$ May
4. $8^{\text{th}}$ May

Q. What is the least common multiple of 7 and 6?

1. 28
2. 30
3. 35
4. 42

Q.

In case of public company minimum no. of members is:

Q.

find the first five common multiples of 2& 3

Q. Which of the following is a common multiple of 5 and 6?

1. 10
2. 12
3. 20
4. 30

Q. Match the pair of numbers with their common multiple.

1. 35
2. 40
3. 15
4. 12

Q. The smallest common multiple of 12 and 15 is

Q.

Fine the L.C.M. of $18,24$ and $32.$

Q.

The least common multiple of 4, 5, 6 is____

1. 35
2. 30
3. 120
4. 60

Q. Think of a number. If it is a multiple of 3 write it in the red circle. If it is a multiple of 5 write it in the blue circle.

Q. The second smallest common multiple of 2, 5 and 4 is .

1. 25
2. 40
3. 20
4. 30

Q. The first common multiple of 2, 5, and 4 is .

1. 24
2. 20
3. 30