Transcript Slide Method for finding GCF and LCM

-You repeatedly find common factors.
-Write the common factors on the left.
-Write the answer that results from
dividing by the common factors on the
right.
-The “slide” stops when the resulting
answers on the right no longer have any
common factors except 1.
-The GCF is then the product of the factors down the left-hand side of the slide
-The LCM is the product of the factors down the left-hand side and the numbers
in the last row of the slide.
Step
1:
Step 3:
*10 doesn’t go
into 88 evenly
causing the
common
factor (10) to
change to 2.
10 8800 10,000
= 880 1,000
10
10
2
=
8800 10,000
880 1,000
88
100
44
50
GFC=10 x 10 x 2 x 2=400
Step 2:
Step 4:
L
G
C
C
M
F
10 8800 10,000
10 880 1,000
=
88
100
10 8800 10,000
10 880 1,000
2
88
100
2
44
50
= 22
25
LCM=10 x 10 x 2 x 2 x 22 x 25 =220,000