I
Name
_
Reteaching
11-9
Dividing Whole Numbers
by Unit Fractions
How can you divide a whole number by a fraction?
Think: How can I divide two into
one-thirds?
2-:-1
.3
1. Two is the sum of one plus one.
2
-
+
1
Il\
2. Each one is the sum of three one-thirds.
1
Il\
1+1+1
+ 1+1+1
333
333
3. Count the number of one-thirds.
6
Check To divide a whole number by a
fraction, multiply the whole number by the
reciprocal of the fraction.
2-:-1=2X~=gx~=§=6
.3
111
1
3~~
. 4
Think: How can I divide three into
three- fourths?
1. Three is the sum of one plus one plus
one.
2. Each one is the sum of one three-fourths
and one one-fourth.
3=
1
+
1\
~+~
1\
+ ~+~
Check Multiply the whole number by the
reciprocal of the fraction.
+ ~+~
+ 1+1+1
~+~+~
+
444
1
1\
~+~+~
444
3. Count the number of three-fourths.
+
1
444
3
4
4
3 -:- ~ = 3 x i = ~ x 1. = 12 = 4
4
3
1 3
3
Draw a picture that shows each division and write the answer.
1• 2~1
. 2
2• 2~.l
. 3
.•
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