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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 6 - Mathematics
1.40 LCM - Prime Factors Method

Find the L.C.M. of 15, 18, and 20 by using prime factorization method.
First, find the prime factors of 15, 18, and 20.
15 = 3 x 5
18 = 2 x 3 x 3
20 = 2 x 2 x 5
Collect the largest number of occurrences of each prime number.
The largest number of times the factor 3 occurs is two.
The largest number of times the factor 2 occurs is two.
The largest number of times the factor 5 occurs is one.

Therefore the L.C.M. is = 3 x 3 x 2 x 2 x 5 = 180.


Directions: Find the L.C.M. using the prime factorization method Also write at least 10 examples of your own.
Q 1: Find the L.C.M. of 96, 72.
288
250
280

Q 2: Find the L.C.M. of 56, 98.
390
392
394

Q 3: Find the L.C.M. of 16, 18, 36.
144
150
140

Q 4: Find the L.C.M. of 420, 1365, 1470.
38220
3820
3800

Q 5: Find the L.C.M. of 98, 288, 256.
2304
2352
2360

Q 6: Find the L.C.M. of 60, 225.
425
450
400

Q 7: Find the L.C.M. of 112, 84, 196.
2352
2340
2350

Q 8: Find the L.C.M. of 205, 110, 305.
275150
24570
275110

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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