Name: 
 

Fractions, Decimals II - Practice Exercise 3-5 - Using LCM to Solve Fraction Problems


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 
 
Answer the following questions:
 

 1. 
Find the LCM of 14 and 21
a.
294
d.
7
b.
1
e.
84
c.
42
 

 2. 
Rewrite the following fraction problem using the GCF and the LCMmc002-1.jpg
a.
 mc002-2.jpg
d.
Can’t be reduced
b.
 mc002-3.jpg
e.
 mc002-5.jpg
c.
 mc002-4.jpg
 

 3. 
Rewrite the following fraction problem using the GCF and the LCM mc003-1.jpg
a.
 mc003-2.jpg
d.
 mc003-5.jpg
b.
 mc003-3.jpg
e.
 mc003-6.jpg
c.
 mc003-4.jpg
 

 4. 
The Least Common Multiple of two numbers is:
a.
 The largest number that can divide the two numbers evenly
b.
The smallest number that can divide the two numbers evenly
c.
The smallest number that can divide the two numbers evenly
d.
The largest number that can divide evenly into the two numbers
e.
The smallest number that can divide evenly into the two numbers
 

 5. 
The LCM of 22 and 66 is:
a.
1
d.
132
b.
22
e.
66
c.
2
 
 
What is the LCM of the following pairs of numbers:
 

 6. 
28, 42
a.
1176
d.
216
b.
14
e.
126
c.
84
 

 7. 
44, 66
a.
132
d.
198
b.
22
e.
264
c.
264
 
 
Use the Greatest Common Factor to reduce all fractions and then use the Least Common Multiple to rewrite the fraction problems with a common denominator:
 

 8. 
mc008-1.jpg
a.
 mc008-2.jpg
d.
 mc008-5.jpg
b.
 mc008-3.jpg
e.
 mc008-6.jpg
c.
 mc008-4.jpg
 

 9. 
mc009-1.jpg
a.
 mc009-2.jpg
d.
 mc009-5.jpg
b.
 mc009-3.jpg
e.
 mc009-6.jpg
c.
 mc009-4.jpg
 

 10. 
mc010-1.jpg
a.
 mc010-2.jpg
d.
 mc010-5.jpg
b.
 mc010-3.jpg
e.
 mc010-6.jpg
c.
 mc010-4.jpg
 



 
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