Write What is LCM of Three given Numbers

Name Grade School
Date Questions20 Score

1
Find the LCM of 16, 24 and 36
2
Find the LCM of 36, 54 and 72
3
Find the LCM of 9, 12 and 16
4
Find the LCM of 6, 8 and 10
5
Find the LCM of 8, 12 and 15
6
Find the LCM of 9, 10 and 15
7
Find the LCM of 8, 9 and 12
8
Find the LCM of 5, 6 and 10
9
Find the LCM of 5, 8 and 10
10
Find the LCM of 30, 36 and 45
11
Find the LCM of 8, 10 and 15
12
Find the LCM of 18, 27 and 36
13
Find the LCM of 9, 15 and 18
14
Find the LCM of 24, 36 and 48
15
Find the LCM of 30, 40 and 50
16
Find the LCM of 10, 20 and 30
17
Find the LCM of 7, 9 and 21
18
Find the LCM of 28, 42 and 56
19
Find the LCM of 16, 20 and 30
20
Find the LCM of 12, 24 and 36

Answers Key
1
Find the LCM of 16, 24 and 36
144 is the LCM of 16, 24 and 36
Factors of 16
216
28
24
22
1
Factors of 24
224
212
26
33
1
Factors of 36
236
218
39
33
1


Factors of 16 = 2 x 2 x 2 x 2
Factors of 24 = 2 x 2 x 2 x 3
Factors of 36 = 2 x 2 x 3 x 3
Multiply all the common and uncommon factors of 16, 24 and 36.
2 x 2 x 2 x 2 x 3 x 3 = 144
LCM(16, 24, 36) = 144
2
Find the LCM of 36, 54 and 72
216 is the LCM of 36, 54 and 72
Factors of 36
236
218
39
33
1
Factors of 54
254
327
39
33
1
Factors of 72
272
236
218
39
33
1


Factors of 36 = 2 x 2 x 3 x 3
Factors of 54 = 2 x 3 x 3 x 3
Factors of 72 = 2 x 2 x 2 x 3 x 3
Multiply all the common and uncommon factors of 36, 54 and 72.
2 x 2 x 2 x 3 x 3 x 3 = 216
LCM(36, 54, 72) = 216
3
Find the LCM of 9, 12 and 16
144 is the LCM of 9, 12 and 16
Factors of 9
39
33
1
Factors of 12
212
26
33
1
Factors of 16
216
28
24
22
1


Factors of 9 = 3 x 3
Factors of 12 = 2 x 2 x 3
Factors of 16 = 2 x 2 x 2 x 2
Multiply all the common and uncommon factors of 9, 12 and 16.
2 x 2 x 2 x 2 x 3 x 3 = 144
LCM(9, 12, 16) = 144
4
Find the LCM of 6, 8 and 10
120 is the LCM of 6, 8 and 10
Factors of 6
26
33
1
Factors of 8
28
24
22
1
Factors of 10
210
55
1


Factors of 6 = 2 x 3
Factors of 8 = 2 x 2 x 2
Factors of 10 = 2 x 5
Multiply all the common and uncommon factors of 6, 8 and 10.
2 x 2 x 2 x 3 x 5 = 120
LCM(6, 8, 10) = 120
5
Find the LCM of 8, 12 and 15
120 is the LCM of 8, 12 and 15
Factors of 8
28
24
22
1
Factors of 12
212
26
33
1
Factors of 15
315
55
1


Factors of 8 = 2 x 2 x 2
Factors of 12 = 2 x 2 x 3
Factors of 15 = 3 x 5
Multiply all the common and uncommon factors of 8, 12 and 15.
2 x 2 x 2 x 3 x 5 = 120
LCM(8, 12, 15) = 120
6
Find the LCM of 9, 10 and 15
90 is the LCM of 9, 10 and 15
Factors of 9
39
33
1
Factors of 10
210
55
1
Factors of 15
315
55
1


Factors of 9 = 3 x 3
Factors of 10 = 2 x 5
Factors of 15 = 3 x 5
Multiply all the common and uncommon factors of 9, 10 and 15.
2 x 3 x 3 x 5 = 90
LCM(9, 10, 15) = 90
7
Find the LCM of 8, 9 and 12
72 is the LCM of 8, 9 and 12
Factors of 8
28
24
22
1
Factors of 9
39
33
1
Factors of 12
212
26
33
1


Factors of 8 = 2 x 2 x 2
Factors of 9 = 3 x 3
Factors of 12 = 2 x 2 x 3
Multiply all the common and uncommon factors of 8, 9 and 12.
2 x 2 x 2 x 3 x 3 = 72
LCM(8, 9, 12) = 72
8
Find the LCM of 5, 6 and 10
30 is the LCM of 5, 6 and 10
Factors of 5
55
1
Factors of 6
26
33
1
Factors of 10
210
55
1


Factors of 5 = 5
Factors of 6 = 2 x 3
Factors of 10 = 2 x 5
Multiply all the common and uncommon factors of 5, 6 and 10.
2 x 3 x 5 = 30
LCM(5, 6, 10) = 30
9
Find the LCM of 5, 8 and 10
40 is the LCM of 5, 8 and 10
Factors of 5
55
1
Factors of 8
28
24
22
1
Factors of 10
210
55
1


Factors of 5 = 5
Factors of 8 = 2 x 2 x 2
Factors of 10 = 2 x 5
Multiply all the common and uncommon factors of 5, 8 and 10.
2 x 2 x 2 x 5 = 40
LCM(5, 8, 10) = 40
10
Find the LCM of 30, 36 and 45
180 is the LCM of 30, 36 and 45
Factors of 30
230
315
55
1
Factors of 36
236
218
39
33
1
Factors of 45
345
315
55
1


Factors of 30 = 2 x 3 x 5
Factors of 36 = 2 x 2 x 3 x 3
Factors of 45 = 3 x 3 x 5
Multiply all the common and uncommon factors of 30, 36 and 45.
2 x 2 x 3 x 3 x 5 = 180
LCM(30, 36, 45) = 180
11
Find the LCM of 8, 10 and 15
120 is the LCM of 8, 10 and 15
Factors of 8
28
24
22
1
Factors of 10
210
55
1
Factors of 15
315
55
1


Factors of 8 = 2 x 2 x 2
Factors of 10 = 2 x 5
Factors of 15 = 3 x 5
Multiply all the common and uncommon factors of 8, 10 and 15.
2 x 2 x 2 x 3 x 5 = 120
LCM(8, 10, 15) = 120
12
Find the LCM of 18, 27 and 36
108 is the LCM of 18, 27 and 36
Factors of 18
218
39
33
1
Factors of 27
327
39
33
1
Factors of 36
236
218
39
33
1


Factors of 18 = 2 x 3 x 3
Factors of 27 = 3 x 3 x 3
Factors of 36 = 2 x 2 x 3 x 3
Multiply all the common and uncommon factors of 18, 27 and 36.
2 x 2 x 3 x 3 x 3 = 108
LCM(18, 27, 36) = 108
13
Find the LCM of 9, 15 and 18
90 is the LCM of 9, 15 and 18
Factors of 9
39
33
1
Factors of 15
315
55
1
Factors of 18
218
39
33
1


Factors of 9 = 3 x 3
Factors of 15 = 3 x 5
Factors of 18 = 2 x 3 x 3
Multiply all the common and uncommon factors of 9, 15 and 18.
2 x 3 x 3 x 5 = 90
LCM(9, 15, 18) = 90
14
Find the LCM of 24, 36 and 48
144 is the LCM of 24, 36 and 48
Factors of 24
224
212
26
33
1
Factors of 36
236
218
39
33
1
Factors of 48
248
224
212
26
33
1


Factors of 24 = 2 x 2 x 2 x 3
Factors of 36 = 2 x 2 x 3 x 3
Factors of 48 = 2 x 2 x 2 x 2 x 3
Multiply all the common and uncommon factors of 24, 36 and 48.
2 x 2 x 2 x 2 x 3 x 3 = 144
LCM(24, 36, 48) = 144
15
Find the LCM of 30, 40 and 50
600 is the LCM of 30, 40 and 50
Factors of 30
230
315
55
1
Factors of 40
240
220
210
55
1
Factors of 50
250
525
55
1


Factors of 30 = 2 x 3 x 5
Factors of 40 = 2 x 2 x 2 x 5
Factors of 50 = 2 x 5 x 5
Multiply all the common and uncommon factors of 30, 40 and 50.
2 x 2 x 2 x 3 x 5 x 5 = 600
LCM(30, 40, 50) = 600
16
Find the LCM of 10, 20 and 30
60 is the LCM of 10, 20 and 30
Factors of 10
210
55
1
Factors of 20
220
210
55
1
Factors of 30
230
315
55
1


Factors of 10 = 2 x 5
Factors of 20 = 2 x 2 x 5
Factors of 30 = 2 x 3 x 5
Multiply all the common and uncommon factors of 10, 20 and 30.
2 x 2 x 3 x 5 = 60
LCM(10, 20, 30) = 60
17
Find the LCM of 7, 9 and 21
63 is the LCM of 7, 9 and 21
Factors of 7
77
1
Factors of 9
39
33
1
Factors of 21
321
77
1


Factors of 7 = 7
Factors of 9 = 3 x 3
Factors of 21 = 3 x 7
Multiply all the common and uncommon factors of 7, 9 and 21.
3 x 3 x 7 = 63
LCM(7, 9, 21) = 63
18
Find the LCM of 28, 42 and 56
168 is the LCM of 28, 42 and 56
Factors of 28
228
214
77
1
Factors of 42
242
321
77
1
Factors of 56
256
228
214
77
1


Factors of 28 = 2 x 2 x 7
Factors of 42 = 2 x 3 x 7
Factors of 56 = 2 x 2 x 2 x 7
Multiply all the common and uncommon factors of 28, 42 and 56.
2 x 2 x 2 x 3 x 7 = 168
LCM(28, 42, 56) = 168
19
Find the LCM of 16, 20 and 30
240 is the LCM of 16, 20 and 30
Factors of 16
216
28
24
22
1
Factors of 20
220
210
55
1
Factors of 30
230
315
55
1


Factors of 16 = 2 x 2 x 2 x 2
Factors of 20 = 2 x 2 x 5
Factors of 30 = 2 x 3 x 5
Multiply all the common and uncommon factors of 16, 20 and 30.
2 x 2 x 2 x 2 x 3 x 5 = 240
LCM(16, 20, 30) = 240
20
Find the LCM of 12, 24 and 36
72 is the LCM of 12, 24 and 36
Factors of 12
212
26
33
1
Factors of 24
224
212
26
33
1
Factors of 36
236
218
39
33
1


Factors of 12 = 2 x 2 x 3
Factors of 24 = 2 x 2 x 2 x 3
Factors of 36 = 2 x 2 x 3 x 3
Multiply all the common and uncommon factors of 12, 24 and 36.
2 x 2 x 2 x 3 x 3 = 72
LCM(12, 24, 36) = 72

Find the LCM of 3 Numbers Worksheet

LCM of 3 numbers worksheet with answers to practice & learn 6th grade math problems on least common multiple is available online for free in printable & downloadable (pdf & image) format. Tap on PRINT, PDF or IMAGE button to print or download this grade-6 worksheet for how to find LCM of given three numbers.

How to Use this Worksheet

In this sixth grade math worksheet, students are required to find what is the least common multiple of given three numbers. To find the LCM of numbers, find the factors of both three numbers. The product of common & independent factors of both 3 numbers form the LCM of given 3 numbers.

Answers Key

Teachers, parents or students can check or validate the solved math workbook of 6th grade math questions on finding the LCM of given three numbers by using the corresponding answers key which comprises the step by step work for each problem in the worksheet.

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