factor trees. what are factor trees for? ever seen a question that said find the prime factors of a...
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Factor Trees
What are Factor Trees for? Ever seen a question that said find the prime factors of a number? Use factor trees to work it out!
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How to find the prime factors of a number with factor trees
Click Next to find out!
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How to make a factor tree
First Choose a numberFind two numbers that when multiplied together equal the number
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8
4 2
Stop when a branch gets to a prime
number, as you can see 4 X 2 equals 8, 2 is a prime number so we stop that branch but 4
isn’t.
2 2
The prime factors of 8 are 2, 2 and 2So 2 X 2 X 2 = 8
OK
X
How to make a factor tree
First Choose a numberFind two numbers that when multiplied together equal the number
Contents
8
4 2
Stop when a branch gets to a prime
number, as you can see 4 X 2 equals 8, 2 is a prime number so we stop that branch but 4
isn’t.
2 2
The prime factors of 8 are 2, 2 and 2So 2 X 2 X 2 = 8
OK
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What are the prime factors of 81?
81
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9 9
3 3 3 3
Type the factors separated by spaces:
HELP!
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What are the prime factors of 81?
81
Contents
9 9
3 3 3 3
Type the factors separated by spaces:
HELP!
Correct!
Next
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Work this out
20
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Type the factors from largest to smallest
separated by spaces:
HELP!
Click below to open paint to work out:
Next
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Well Done!Contents
You can also write the prime factors in indexed notation:5 X 22
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ContentsWhat are Factor Trees for?How to find the prime factors of a number with factor trees How to make a factor treeWhat are the prime factors of 81?Work this out
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