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  • What is this question used for?
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  • How is the question randomised?
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Checkpoint description

Describe what's changed since the last checkpoint.

Elliott Fletcher 2 years, 1 month ago

Published this.
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Christian Lawson-Perfect 2 years, 2 months ago

Gave some feedback: Ready to use

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Christian Lawson-Perfect 2 years, 2 months ago

Saved a checkpoint:

Good question!

It seems you didn't know about display mode maths while writing the advice: enclose maths in \[ and \] instead of dollar signs to place it at the centre of its own line with a good margin.

Restore this checkpoint

Lauren Richards 2 years, 2 months ago

Gave some feedback: Needs to be tested

Vicky Hall 2 years, 2 months ago

I've fixed the variables so that part e) will simplify if it needs to in the advice. I also changed the variables slightly in part b) to avoid ever having square numbers under the roots. 

Lauren Richards 2 years, 2 months ago

I've randomised parts e) and f) now too but having problems with getting e) to finally simplify. Vicky would you mind having a look at this please? I've written THIS NEEDS TO SIMPLIFY next to the issue!

As a result of not getting it simplified, I haven't set the correct answers yet. 

Lauren Richards 2 years, 2 months ago

Gave some feedback: Has some problems

Lauren Richards 2 years, 2 months ago

I've randomised parts a) to d). 

Lauren Richards 2 years, 2 months ago

Gave some feedback: Needs to be tested

Aiden McCall 2 years, 2 months ago

Advice:

a) The advice for part a does not match the question. You could also possibly show another method of multiplying by the denominator to realise the bottom; I could be overcomplicating it with this alternative method, so it is up to you.
b) I would put the 12 in '12 is the denominator' in math mode. Not sure what the last line means I think it is suppose to read $\frac{\sqrt{ab}}{1}$ but reads as $\frac{\sqrt{ab}}{[1,1,1,1,1]}$.
c) Is good
d) There could be some confusing with the wording, "this is the denominator with a changed sign." It could be interpretted as the whole denominator changing signs; I would possibly change it to the rational term sign changed, or something to that effect. 

Aiden McCall 2 years, 2 months ago

a) On my first attempt of the question, I had received the same question for parts i) & ii). This can be fixed with except in your random variables so the same two values do not occur.

b) Everything fine.

c) I'm not sure if you need a semi-colon if you have an 'and' as this does not create two main clauses. When testing this question it always came up as the same values also. It would be more beneficial for someone practising to have a randomising example everytime.

d) Personally I think the question could be presented as "Express [equation] in the form $a \sqrt{b} + m$ where a, b and m are integers or something of that nature. I also think the answer is incorrect and not displayed as one of the options. $\frac{4}{(\sqrt{3}-2)}=-8-4\sqrt{3}&. The question is also not randomised so comes up the same each time.

e),f) both not randomised so the student cannot try another like this and get different values.

Aiden McCall 2 years, 2 months ago

Gave some feedback: Has some problems

Lauren Richards 2 years, 2 months ago

Gave some feedback: Needs to be tested

Lauren Richards 2 years, 2 months ago

Gave some feedback: Has some problems

Lauren Richards 2 years, 3 months ago

I have put all of the questions about rationalising the denominator together. 

I didn't know how to enact your feedback for part e) in the previous question (which is now part b) in this question). It was "I got $\frac{\sqrt{6}}{\sqrt{3}}$ which it expected me to write as $\frac{\sqrt{18}}{3}$. I'd write that as just $\sqrt{2}$. Can you set it up so there's only one way of writing it? Making sure the top and bottom of the original fraction are coprime might do it."

Lauren Richards 2 years, 3 months ago

Gave some feedback: Needs to be tested

Lauren Richards 2 years, 3 months ago

Created this.
Name Status Author Last Modified
Rationalising the denominator - surds Ready to use Lauren Richards 01/08/2017 14:13
Simon's copy of Rationalising the denominator - surds draft Simon Thomas 06/06/2019 11:00

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