Greatest Common Factor and Least Common Multiple
Math ⇒ Number and Operations
Greatest Common Factor and Least Common Multiple starts at 6 and continues till grade 12.
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See sample questions for grade 10
Explain how to find the GCF of three numbers using prime factorization.
Explain the difference between GCF and LCM.
Explain why the GCF of any number and 1 is always 1.
Find the GCF of 120 and 144.
Find the GCF of 56, 84, and 98.
Find the GCF of 81 and 54.
Find the LCM of 15, 20, and 30.
Find the LCM of 25 and 30.
Which method can be used to find the GCF of two numbers?
(1) Prime factorization
(2) Division method
(3) Listing all factors
(4) All of the above
Which of the following is NOT a method to find the LCM?
(1) Prime factorization
(2) Listing multiples
(3) Subtraction method
(4) Division method
Which of the following is the GCF of 24, 36, and 60?
(1) 6
(2) 12
(3) 24
(4) 18
Which of the following is the GCF of 45 and 75?
(1) 5
(2) 15
(3) 25
(4) 45
The GCF of 100 and 250 is _______.
The GCF of 18 and 24 is _______.
The GCF of 32 and 48 is _______.
The GCF of 42 and 56 is _______.
If two numbers are both even, is their GCF always even?
If two numbers are both multiples of 5, is their LCM always a multiple of 5?
Is it possible for the GCF and LCM of two numbers to be equal?
True or False: The GCF of two numbers is always a factor of their LCM.
