Understanding Least Common Multiple

Understanding Least Common Multiple

Assessment

Interactive Video

Mathematics, Science

5th - 8th Grade

Practice Problem

Hard

Created by

Liam Anderson

FREE Resource

This video tutorial explains how to find the least common multiple (LCM) of numbers using prime factorization. It begins with an introduction to the concept of LCM, followed by a demonstration of creating a factor tree for prime factorization. The tutorial then shows how to organize the factors into a chart to minimize errors. Finally, it walks through the steps to calculate the LCM by multiplying the necessary factors and concludes with a recap of the process.

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9 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the least common multiple (LCM) of a set of numbers?

The product of all the numbers

The sum of all the numbers

The smallest number that all the numbers divide into evenly

The largest number that divides all the numbers

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method is used in the video to find the LCM?

Long division

Prime factorization

Addition

Subtraction

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the prime factorization of the number 4?

5 x 1

2 x 2

3 x 3

2 x 3

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many prime numbers are used in the factorization of 12?

One

Three

Two

Four

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which number is already a prime number among 4, 12, and 5?

None

5

12

4

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the rule for selecting numbers from the prime factorization chart to find the LCM?

Use the largest number in each column

Use only one of each number in any column

Use the smallest number in each column

Use all numbers

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the LCM of 4, 12, and 5 as calculated in the video?

60

120

30

20

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