Worksheet 4 - The Highest Common Factor (HCF) and the Lowest Common Multiple (LCM)

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