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Least Common Multiples and Least Common Denominator
Flashcard
•
Mathematics
•
3rd - 5th Grade
•
Practice Problem
•
Hard
Standards-aligned
Wayground Content
FREE Resource
Student preview
13 questions
Show all answers
1.
FLASHCARD QUESTION
Front
Here are the first ten multiples of 3 and 5. 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 Which multiple is the Least Common Multiple (LCM) of 3 and 5?
Back
15
Answer explanation
15 and 20 are both common multiples of 3 and 5! But the LEAST common multiple is 15 because 15 is less than 20 and the first multiple that has the factors 3 and 5.
2.
FLASHCARD QUESTION
Front
What is the Least Common Multiple (LCM) of 4 and 5?
Back
The LCM is 20
Answer explanation
The LCM of 4 and 5 is 20! It's the first multiple on both lists and has the factor 4 and 5.
3.
FLASHCARD QUESTION
Front
What is the Least Common Multiple (LCM) of 2 and 4? 2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40 (Hint! Look for the first number that is the same on both lists!)
Back
4
Answer explanation
The LCM of 2 and 4 is 4! It's the first multiple that is the same on both lists and has the factors 2 and 4!
Fun fact! All the multiples of 4 are common multiples of 2 because all the multiples of 4 are even numbers!
4.
FLASHCARD QUESTION
Front
LCM of 3 and 6
Back
6
Answer explanation
The LCM of 3 and 6 is 6!
Fun fact! All the multiples of 6 are also common multiples of 3!
5.
FLASHCARD QUESTION
Front
LCM of 10 and 12
Back
60
Answer explanation
The LCM for 10 and 12 is 60!
Fun fact! If you are trying to find the least common multiple of a number and 10, look for the first multiple of the other number that ends with a zero!
6.
FLASHCARD QUESTION
Front
What is the LCM of 12 and 20?
Back
60
Answer explanation
The LCM of 12 and 20 is also 60!
7.
FLASHCARD QUESTION
Front
How do you feel about finding the Least Common Denominator (LCD) of two fractions using Least Common Multiple (LCM)?
Back
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