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 Post subject: Year 8 Maths Question HelpPosted: Mon Sep 12, 2016 6:12 pm

Joined: Mon Sep 12, 2016 5:06 pm
Posts: 1
cuboid is made from 120 small cubes.The prime factor decomposition of 20= 2 to the power of 3 X 3 X 5
One way of combining the factors is 2 to the power of 2 X (2X3) X 5= 4X6X5
The dimensions of the cuboid could be 4 X 6 X 5
List the dimensions of 3 different cuboids that could be made with 120 cubes.
Thanks x

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 Post subject: Re: Year 8 Maths Question HelpPosted: Mon Sep 12, 2016 6:19 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11940
DylanHodder wrote:
cuboid is made from 120 small cubes.The prime factor decomposition of 20= 2 to the power of 3 X 3 X 5
One way of combining the factors is 2 to the power of 2 X (2X3) X 5= 4X6X5
The dimensions of the cuboid could be 4 X 6 X 5
List the dimensions of 3 different cuboids that could be made with 120 cubes.
Thanks x

Look at the prime factor decomposition of 120 [I assume you meant] = 2 x 2 x 2 x 3 x 5

They've given you one way (2 x 2) x (2 x 3) x 5

Look at other ways of combining the prime factors ... you can pm me if you want me to check your answers.

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