.~
Fun w/Fractions
Guided Notes
Chapter 8 - Adding Three Fractions
Method 1 - Using Rule of 4 Twice:
Example:
131
-+-+342
First use Rule of 4 on the first two fractions:
-
-
Try this problem using Rule of 4 Twice:
211
3 + 5 + 2
Method 2 - Finding a common factor for all three fractions.
Example:
131
-+-+342
lxL}x2-3x4x2
3
+4
x~x2.
x~x2...
1x3x'f
+2X'"SXtf
S
-2'-1
+ -1& + 2-Lf
-(2''Z-L{
..-
--
Try this problem using Method 2, SHOW YOUR WORK!
211
3
2XS'XZ3XS'Xl..-
r>.
20
---7;u
+
5
+ 2
1 X z.>
+ 5 xZX>+
~-t
,v,
30
-t
7
1 x'3xS;
2 x'3 X
30
lS
-.:;..-
5
Lr\
30
l~
3u
l
Method 3:
113
2 + 4 + 8
First, we need to see that the least common multiple of 2, 4 and 8 for the denominator IS 8, so
3/8 is done. Now we need to modify the first two fractions by multiplying by a form of 1 to get a
common denominator of 8.
Y
Y
1 X
--...;.....;...+
2 X
1 X Z-
+3
y
Z,
8
8
4
X
+
9
8
Try this problem using Method 3:
-
\
}O
lO
--to
L8
+~
8