GCF-LCM In-class Exercise - page 2
Name ______________
Find the least common multiple (LCM) of these pairs of numbers:
1. Write out the multiples of both numbers to their right.
2. Find the smallest one that appears in both lists and circle it.
1).
(I'll get you started with this one):
Multiples of 12: 12, 24, 36, 48, 60, 72
Multiples of 20: __________________
LCM = _____ |
2).
Multiples of 7__________________
Multiples of 4: __________________
LCM = _____ |
3).
Multiples of 6: __________________
Multiples of 10: __________________
LCM = _____
|
4).
Multiples of 4: __________________
Multiples of 3: __________________
LCM = _____ |
5).
Multiples of 10: __________________
Multiples of 25: __________________
LCM = _____ |
6).
Multiples of 14: __________________
Multiples of 6: ____________________
LCM = _____ |
Find the greatest common factor (GCF ) of these pairs of numbers by using the GCF formula:
GCF(a,b) = (a x b) / LCM(a,b)
The pairs of numbers below are the same as above, so you can use the LCMs you found to find their GCF:
7).
GCF (12,20) =
(12 x 20) / _____ = _____
|
8).
GCF (7,4) =
______________ = _____
|
9).
GCF (6,10) =
_______________ = ____
|
10).
GCF (4,3) =
_______________ = ____
|
11).
GCF (10,25) =
_______________ = ____ |
12).
GCF (14,6) =
_______________ = ____ |
|