Comments on: Mr Atkins’ Year 8

By: Poppy Langridge

Poppy Langridge — Sun, 18 Sep 2011 19:29:00 +0000

Thank you! I understand it now.
poppy

By: Mrs Tibble

Mrs Tibble — Sun, 18 Sep 2011 18:50:36 +0000

Hi Poppy,

Index is another word for power so it will be something to do with simplifying multiplying or multiplying numbers with powers together.

As I don’t know what question you are doing, I’ll give you a few examples.

It could be writing 5 x 5 x 5 as 5-cubed

or 3 x 3 x 7 x 7 x 7 as 3-squared x 7-cubed (use powers where I have used words)

The law that you are using here is that when you multiply, you ADD the powers.

Hope that helps!

Mrs Tibble

By: Poppy Langridge

Poppy Langridge — Sun, 18 Sep 2011 16:44:23 +0000

By: Poppy Langridge

Poppy Langridge — Sun, 18 Sep 2011 15:47:57 +0000

I’m doing Prime Factor decomposition and the question says:
Use an index law to simplify….
I don’t know what a index law is.

By: Poppy Langridge

Poppy Langridge — Sun, 18 Sep 2011 15:44:38 +0000

What is a index law??

By: Ellie Wyncoll

Ellie Wyncoll — Fri, 17 Dec 2010 09:34:39 +0000

Hi Mr A. Merry Christmas

By: Mrs Tibble

Mrs Tibble — Sat, 27 Nov 2010 18:19:54 +0000

Hi Katie,
If 20mm is the radius, then yes that’s right, and whatever answer you get, that’s the circumference in mm.
JT
PS it’s ‘pi’

By: Katie M

Katie M — Sat, 27 Nov 2010 18:17:57 +0000

i mean like if it was 20mm would i do 2 x pie x 20? and what that equals is my answer?

By: Katie M

Katie M — Sat, 27 Nov 2010 17:40:35 +0000

would it be just 2 x pie x 5 then???

By: Mrs Tibble

Mrs Tibble — Sat, 27 Nov 2010 11:05:42 +0000

Hi Katie,

Use the units of the question.
eg if the radius of a circle is 5 metres, then the circumference is 2 x pi x 5 metres.
Your answer will be in whatever units your radius is in.
The only place you have to be careful is if you are doing volume and the lengths are given to you in different units.
Hope that helps.
JT