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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 6 - Mathematics
1.39 LCM - Least Common Multiple

Some Important Points:

1. To get the multiples of a given natural number, we have to multiply the given natural number by various natural numbers.

2. There is no end to the multiples of a given natural number. That is, the set of the multiples of a given natural number is infinite.

3. Two natural numbers can have countless common multiples. The set of common multiples of two natural numbers is infinite.

4. The smallest of the common multiples of two or more natural numbers is called their least common multiple (L.C.M.).

5. If two numbers are co-prime, then their L.C.M. is equal to their product.

6. Given two numbers, if the first number is a multiple of the second number, then their L.C.M. is equal to the first number.

Example: Find the L.C.M. of the 30 and 48.

Therefore, L.C.M. of 30 and 48 is = 2 x 3 x 5 x 8 = 240.


Directions: Find the L.C.M. of the given numbers using the above method. Also write at least 10 examples of your own.
Q 1: Find the L.C.M. of 16, 30.
240
200
250

Q 2: Find the L.C.M. of 23, 69.
120
69
23

Q 3: Find the L.C.M. of 40, 140.
280
200
250

Q 4: Find the L.C.M. of 50, 60, 70.
2100
2000
1500

Q 5: Find the L.C.M. of 60, 80, 120.
200
240
220

Q 6: Find the L.C.M. of 570, 665, 266.
75810
75800
75000

Q 7: Find the L.C.M. of 13, 17.
221
250
17

Q 8: Find the L.C.M. of 665, 266.
1330
1350
1300

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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