Express 300 as a product of its prime factors.

Factors of a number are: numbers that can be multiplied (by a whole number/ integer) to make the original number. For example, 6 is a factor of 42, because 6 can be multiplied by 7 to make 42.

Prime numbers are numbers that cannot be divided by anything except themselves and 1 to give a whole number answer; for example 3 and 11.

Each time you find a prime factor, circle it in your working, so you do not end up missing one out in your final answer - in this example I underline each prime factor I find.

In order to split 300 into its prime factors, first of all think of a number than goes into 300:

-Let us start with 30. 30 goes into 300 at total of 10 times, as 30x10=300.

-So, we now have two factors of 300: 30 and 10. Now, we must find the factors of these two numbers:

- Factors of 10: 5 x 2 = 10. As the numbers 5 and 2 are both prime numbers, they are counted as prime factors for 300.

-Factors of 30: 3 x 10 = 30. As 3 is a prime number, we have found another prime factor of 300.

However, 10 is not a prime factor, and so we must keep going: 5 x 2 = 10, and therefore we have found another two prime factors: 5 and 2.

Looking back over your working, write down every number that is circled (or in this case, underlined): 5, 2, 3, 5, 2

So, we can write 300 as a product (multiplication) of its prime factors by multiplying them all: 2 x 2 x 3 x 5 x 5

This can be rewritten as 22 x 3 x 52

Answered by Alice M. Maths tutor

68723 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve the two simultaneous equations: 2x - 5y = 11 and 3x + 2y = 7


Show that sqrt(20) = 2sqrt(5)


A ladder 6.8m long is leaning against a wall, the foot of the ladder is 1.5m from the wall, find the height that the ladder reaches up the wall.


How do you calculate arc length and sector area and why is it calculated like this? You are given sector angle 40 degrees and radius 7cm and asked to give answers to 3sf.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences