This document provides directions and steps to find the greatest common factor (GCF) and least common multiple (LCM) for three sets of numbers. For the first set of numbers (21, 24, 36), the GCF is 3 and the LCM is 2,016. The GCF of the second set (35, 45) is 5 and the LCM is 315. For the final set of numbers (63, 72, 81), the GCF is 9 and the LCM is 4,536.

1. Finding GCF
and LCM

2. Direction: Find the GCF
and LCM of the following
numbers.

3. Direction: Find the GCF and LCM of the
following numbers.
1.21, 24, 36
2. 35, 45
3. 63, 72, 81

4. 21, 24, 36
21 24 36
7 8 12
3
GCF = 3
LCM = 3 x 7 x 8 x 12
= 2,016

5. 35, 45
35 45
7 9
5
GCF = 5
LCM = 5 x 7 x 9
= 315

6. 63, 72, 81
63 72 81
21 24 27
7 8 9
3
3
GCF = 3 x 3 = 9
LCM = 3 x 3 x 7 x 8 x 9
= 4,536