1.5 Greatest Common Factor And Least Common Multiple Worksheet With Answers - College Of The Sequoias Page 9
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11Exercise Set 1.5
Find the (a) greatest common factor and (b) least common multiple for each set of numbers by
listing factors and multiples.
1.
45, 60
2.
16, 20
3.
80, 100
4.
60, 90
5.
16, 30
6.
24, 30
7.
36, 54
8.
14, 63
9.
8, 12, 15
10. 10, 25, 40
11. 20, 30, 40
12. 18, 27, 36
Find the (a) greatest common factor and (b) least common multiple for each set of numbers by
using primes.
13. 48, 72
14. 70, 170
15. 36, 40
16. 45, 81
17. 216, 234
18. 220, 242
19. 270, 320
20. 275, 286
21. 384, 432
22. 364, 468
23. 261, 290
24. 265, 424
25. 16, 18, 54
26. 15, 24, 40
27. 22, 65, 121
28. 16, 38, 76
Find the (a) greatest common factor and (b) least common multiple for each set of expressions.
2
5
3
3
3
7
6
4
29. 45x
y
,15x
y
30. 30x
y
,15x
y
7
6
5
2
6
5
4
3
31. 8a
b
, 6a
b
32. 12a
b
,18a
b
8
12
9
7
6
11
9
8
33. 16x
y
, 20x
y
34. 36x
y
, 24x
y
2
3
3
4
4
5
4
2
2
3
7
35. 4x
y
, 6x
y
, 8x
y
36. 10x
y
, 5x
y
,15x
y
Recall that two numbers are relatively prime if their GCF is 1. Determine whether each pair of
numbers is relatively prime.
37. 70, 75
38. 32, 84
39. 35, 72
40. 49, 93
41. 81, 192
42. 245, 246
43. 155, 248
44. 153, 272
48
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