

Number Systems 2
Presentation
•
Mathematics
•
8th Grade
•
Hard
Munashe-Liam Chifokoyo
Used 1+ times
FREE Resource
8 Slides • 4 Questions
1
AMDG
Number Systems 2
LESSON 2
Expressing a number as a product of its prime factors.

2
Practice questions
Find the prime factors of the following numbers and express
them as a product of prime numbers.
a) 12
b) 32
c) 36
d) 231
e) 44
3
RECAP - Prime, Even & Odd Numbers
EVEN NUMBER - A number that can be exactly divided by 2.
ODD NUMBER - A number that cannot be divided exactly into pairs.
PRIME NUMBER - A number divisible only by itself and 1.
4
Prime Factors.
Find the prime factors of 18.
The factors of 18 are 1, 2, 3, 6, 9 and 18.
Of these, 2 and 3 are prime numbers, so 2 and 3 are the prime
factors of 18.
5
Prime factors of 18
An easy way to find prime factors is to divide by the prime
numbers in order, smallest first.
6
Multiple Select
1. List the prime factors of 15.
3
1
5
15
7
Multiple Select
2. List the prime factors of 40.
10
5
2
8
8
Expressing a number as a product of its prime factors.
We've already covered the first part of this process by finding the prime factors of 18 in the table.
9
Example 1
Find the prime factors of 24 and express it as a product of
prime numbers:
24=23×3
10
Example 2
Find the prime factors of 75 and express it as a product of prime numbers:
75=3×5×5 OR
75=3×52
11
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AMDG
Number Systems 2
LESSON 2
Expressing a number as a product of its prime factors.

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