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From users who are members of Transition to university :
Christian LawsonPerfect  said  Ready to use  6 years, 7 months ago 
Elliott Fletcher  said  Needs to be tested  6 years, 7 months ago 
Lauren Richards  said  Has some problems  6 years, 7 months ago 
Chris Graham  said  Has some problems  6 years, 8 months ago 
From users who are not members of Transition to university :
francisco Glezortiz  said  Ready to use  3 years, 1 month ago 
History
Christian LawsonPerfect 4 months, 3 weeks ago
Saved a checkpoint:
Added a `+ to the pattern for part e, to allow negative coefficients.
francisco Glezortiz 3 years, 1 month ago
Gave some feedback: Ready to use
francisco Glezortiz 3 years, 1 month ago
Gave some feedback: Needs to be tested
Christian LawsonPerfect 4 years, 9 months ago
Saved a checkpoint:
Replaced some javascript with pattern restrictions. There are still some string restrictions that could be replaced with pattern restrictions.
Elliott Fletcher 6 years, 6 months ago
Published this.Christian LawsonPerfect 6 years, 7 months ago
Gave some feedback: Ready to use
Christian LawsonPerfect 6 years, 7 months ago
Saved a checkpoint:
I changed the denominators for parts f,g and h from number entry to mathematical expression. While the answer is always a number, a student who's misunderstood might want to write a surd. You should let them fail!
I don't know why each line of the derivations ended with a comma, but this isn't conventional.
With those things fixed, this is a good question.
Elliott Fletcher 6 years, 7 months ago
Gave some feedback: Needs to be tested
Lauren Richards 6 years, 7 months ago
Gave some feedback: Has some problems
Lauren Richards commented 6 years, 7 months ago
 MAIN PARTS
 Part a) should have more numbers rather than just two.
 I think you will have a problem with people not knowing how to insert a square root sign into their answers, meaning they will be scuppered for all of the questions. I think you will need to tell them how to in the parts by giving an example. Say like "3\sqrt{5} can be written as 3*sqrt(5)". Alternatively, you could set it up via gap fill so that all of the answers can be given in a preprepared square root sign.
 Part b)'s steps could be a little offputting for someone. They only need the first rule to do part b) but you have given them an extra rule that isn't relevant. It might confuse them.
 You don't need colons after "Simplify" in each part.
 Part h), your model answer included an unsimplified numerator, which might not be what the user gives. You didn't multiply out 3(\sqrt{3}+18) but writing 3\sqrt{13}+54 is not wrong.
 ADVICE
 I think you should restate the question in part a) after stating the rule and before the actual advice for part a).
 The examples listed for part a) and b) were not the ones I was asked in the test run. It was talking about \sqrt{405} both times when I had been asked about \sqrt{1377} in part a) and \sqrt{1053} in part b).
 In part c), I think you should show how the fraction cancels down a bit more by stating that the two \sqrt{17} cancel on the numerator and denominator. Someone might get lost if they followed the first method.
Elliott Fletcher commented 6 years, 8 months ago
Thanks for your feedback, i have corrected the mistakes
Elliott Fletcher 6 years, 8 months ago
Gave some feedback: Needs to be tested
Chris Graham commented 6 years, 8 months ago
Rather than having "Answer:" before the gap, I think I'd rather that the surd was repeated, e.g. "$\frac{1}{\sqrt{11}}=$"
In (g) and (h) your answers are displayed with a decimal on the numerator, which I presume is not what you intended. The reason for this is that the braces evaluate {{n}sqrt({a})} to a decimal number. Try this instead to retain the integer values of n and a:
({n}sqrt({a}))/{{n}^2{a}}.
Good work with the advice, which is well laid out and punctuated.
Chris Graham 6 years, 8 months ago
Gave some feedback: Has some problems
Elliott Fletcher 6 years, 8 months ago
Gave some feedback: Needs to be tested
Elliott Fletcher 6 years, 8 months ago
Created this.Name  Status  Author  Last Modified  

Using Surds, Rationalising the Denominator  Ready to use  Elliott Fletcher  27/09/2023 09:14  
Katherine's copy of Using Surds, Rationalising the Denominator  draft  Katherine Tomlinson  31/07/2017 11:50  
Using Surds, Rationalising the Denominator  draft  Adrian Jannetta  16/08/2023 14:56  
Surds Rationalisation  draft  Johnny Yi  24/01/2019 04:29  
Surds Rationalisation (Diagnostic Test)  draft  Johnny Yi  24/01/2019 04:30  
Simon's copy of Using Surds, Rationalising the Denominator  draft  Simon Thomas  06/06/2019 09:40  
John's copy of Using Surds, Rationalising the Denominator  draft  John Wick  17/06/2019 11:00  
John's copy of John's copy of John's copy of John's copy of John's copy of John's copy of John's copy of John's copy of John's copy of John's copy of John's Using Surds, Rationalising the Denominator  draft  John Wick  10/07/2019 16:00  
Ausdrücke mit Quadratwurzeln vereinfachen  Ready to use  Ulrich Görtz  26/11/2020 10:28 
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