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Worksheet 4 - The Highest Common Factor (HCF) and the Lowest Common Multiple (LCM)  (Difficulty level: Easy)
The Highest Common Factor (H.C.F.) of:
12 and 6 is ____ 8 and 4 is ____ 20 and 30 is ____ 45 and 10 is ____ 10 and 8 is ____
15 and 21 is ____ 4 and 12 is ____ 15 and 21 is ____ 35 and 30 is ____ 10 and 40 is ____
12 and 10 is ____ 14 and 16 is ____ 45 and 10 is ____ 40 and 45 is ____ 14 and 8 is ____
45 and 40 is ____ 6 and 16 is ____ 30 and 15 is ____ 6 and 24 is ____ 4 and 18 is ____
45 and 20 is ____ 6 and 27 is ____ 9 and 27 is ____ 27 and 21 is ____ 21 and 15 is ____
21 and 9 is ____ 12 and 10 is ____ 21 and 27 is ____ 12 and 4 is ____ 6 and 4 is ____
15 and 27 is ____ 9 and 27 is ____ 21 and 9 is ____ 6 and 4 is ____ 15 and 24 is ____
9 and 15 is ____ 12 and 18 is ____ 16 and 12 is ____ 8 and 6 is ____ 12 and 10 is ____
18 and 16 is ____ 15 and 10 is ____ 16 and 14 is ____ 4 and 16 is ____ 15 and 20 is ____
21 and 15 is ____ 12 and 6 is ____ 20 and 40 is ____ 8 and 4 is ____ 15 and 21 is ____
18 and 15 is ____ 15 and 21 is ____ 10 and 8 is ____ 12 and 10 is ____ 24 and 18 is ____
40 and 15 is ____ 20 and 25 is ____ 21 and 24 is ____ 35 and 15 is ____ 24 and 18 is ____
25 and 45 is ____ 24 and 15 is ____ 20 and 45 is ____ 12 and 10 is ____ 30 and 20 is ____
45 and 15 is ____ 21 and 15 is ____ 12 and 6 is ____ 6 and 24 is ____ 40 and 35 is ____
20 and 15 is ____ 30 and 27 is ____ 10 and 8 is ____ 15 and 45 is ____ 12 and 10 is ____
The Lowest Common Multiple (L.C.M.) of:
4 and 8 is ____ 9 and 10 is ____ 25 and 30 is ____ 6 and 8 is ____ 10 and 25 is ____
10 and 20 is ____ 75 and 15 is ____ 25 and 12 is ____ 15 and 12 is ____ 9 and 25 is ____
15 and 9 is ____ 9 and 30 is ____ 4 and 15 is ____ 25 and 8 is ____ 9 and 8 is ____
10 and 8 is ____ 6 and 10 is ____ 10 and 30 is ____ 4 and 9 is ____ 15 and 10 is ____
6 and 30 is ____ 10 and 36 is ____ 6 and 20 is ____ 10 and 12 is ____ 6 and 25 is ____
6 and 30 is ____ 4 and 8 is ____ 40 and 10 is ____ 15 and 24 is ____ 6 and 15 is ____
6 and 25 is ____ 25 and 6 is ____ 6 and 8 is ____ 6 and 20 is ____ 6 and 20 is ____
6 and 12 is ____ 9 and 24 is ____ 15 and 30 is ____ 15 and 12 is ____ 6 and 16 is ____
4 and 10 is ____ 6 and 20 is ____ 25 and 15 is ____ 10 and 12 is ____ 4 and 15 is ____
15 and 8 is ____ 15 and 9 is ____ 15 and 30 is ____ 15 and 12 is ____ 10 and 18 is ____
4 and 30 is ____ 25 and 12 is ____ 15 and 6 is ____ 9 and 12 is ____ 6 and 36 is ____
10 and 12 is ____ 6 and 18 is ____ 12 and 6 is ____ 15 and 8 is ____ 4 and 6 is ____
15 and 12 is ____ 25 and 12 is ____ 15 and 12 is ____ 15 and 20 is ____ 9 and 4 is ____
6 and 20 is ____ 6 and 24 is ____ 25 and 9 is ____ 15 and 20 is ____ 15 and 16 is ____
9 and 24 is ____ 10 and 8 is ____ 6 and 12 is ____ 6 and 30 is ____ 10 and 36 is ____

Copyright 2009 - Adam Malinowski. (Member of CAL, Statutory Licence Schemes)