Finding LCM and GCF Using Factor Trees

Finding LCM and GCF Using Factor Trees

Assessment

Interactive Video

Mathematics, Science

5th - 8th Grade

Practice Problem

Hard

Created by

Olivia Brooks

FREE Resource

This video tutorial from MooMooMath and Science explains how to find the greatest common factor (GCF) and the lowest common multiple (LCM) of the numbers 72, 96, and 120 using factor trees. The instructor demonstrates how to create factor trees for each number, identify prime numbers, and organize them into a chart. The video then guides viewers through the process of finding the GCF by identifying triplets of prime numbers and calculating their product. Similarly, it explains how to find the LCM by multiplying the necessary prime numbers, following specific rules for triplets. The tutorial concludes with a motivational message about kindness.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of using a factor tree in finding the GCF and LCM?

To divide the numbers

To add the numbers

To identify prime factors

To simplify the numbers

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a prime factor of 72?

3

7

5

9

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many times does the number 2 appear in the factor tree of 96?

Three times

Four times

Five times

Six times

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the next step after creating the factor trees for the numbers?

Add the numbers

Divide the numbers

Multiply the numbers

Create a chart of prime factors

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the greatest common factor of 72, 96, and 120?

12

18

30

24

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When calculating the GCF, what are you looking for among the numbers?

Pairs of numbers

Triplets of prime factors

Quadruplets of numbers

Single prime factors

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the rule for selecting numbers when calculating the LCM?

Select one number from each triplet

Select only even numbers

Select all numbers

Select only odd numbers

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