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### History

#### Checkpoint description

Describe what's changed since the last checkpoint.

#### francisco Glezortiz1 year, 4 months ago

Gave some feedback: Ready to use

#### francisco Glezortiz1 year, 4 months ago

Gave some feedback: Needs to be tested

#### Christian Lawson-Perfect3 years ago

Saved a checkpoint:

Replaced some javascript with pattern restrictions. There are still some string restrictions that could be replaced with pattern restrictions.

Published this.

#### Christian Lawson-Perfect4 years, 10 months ago

Gave some feedback: Ready to use

#### Christian Lawson-Perfect4 years, 10 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 Fletcher4 years, 11 months ago

Gave some feedback: Needs to be tested

#### Lauren Richards4 years, 11 months ago

Gave some feedback: Has some problems

#### Lauren Richards commented 4 years, 11 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 pre-prepared square root sign.
• Part b)'s steps could be a little off-putting 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 4 years, 11 months ago

Thanks for your feedback, i have corrected the mistakes

#### Elliott Fletcher4 years, 11 months ago

Gave some feedback: Needs to be tested

#### Chris Graham commented 4 years, 11 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 Graham4 years, 11 months ago

Gave some feedback: Has some problems

#### Elliott Fletcher4 years, 11 months ago

Gave some feedback: Needs to be tested

#### Elliott Fletcher4 years, 11 months ago

Created this.
Name Status Author Last Modified
Using Surds, Rationalising the Denominator Ready to use Elliott Fletcher 09/01/2021 10:56
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 25/09/2017 16:30
Harry's copy of Using Surds, Rationalising the Denominator draft Harry Flynn 18/11/2018 12:39
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
Katy's copy of Using Surds, Rationalising the Denominator Ready to use Katy Dobson 20/09/2019 15:10
Paul's copy of Using Surds, Rationalising the Denominator draft Paul Verheyen 01/10/2019 16:48
Ann's copy of Using Surds, Rationalising the Denominator draft Ann Smith 20/01/2020 14:08
ibrahim's copy of Using Surds, Rationalising the Denominator draft ibrahim khatib 10/02/2020 15:40
NUMBAS practice: Operating with Surds Ready to use Joanna Rankins 07/04/2020 00:43
Ahmed's copy of Using Surds, Rationalising the Denominator draft Ahmed Al-Razaz 02/10/2020 13:00
Esercizi sui radicali draft Irene Paniccia 25/05/2020 17:52
ibrahim's copy of Simon's copy of Using Surds, Rationalising the Denominator draft ibrahim khatib 16/08/2020 11:36
Ausdrücke mit Quadratwurzeln vereinfachen Ready to use Ulrich Görtz 26/11/2020 10:28
Surds draft Johnny Yi 05/11/2020 12:32
Racionalizar draft francisco Glezortiz 03/02/2021 09:43
Radicales draft francisco Glezortiz 03/02/2021 09:55
Nicolas's copy of Using Surds, Rationalising the Denominator draft Nicolas Sawyer 21/03/2021 08:31
Rationalising the Denominator draft Kate Henderson 20/05/2021 14:46
Daisy's copy of Using Surds, Rationalising the Denominator draft Daisy Lake 29/06/2021 11:35
Daisy's copy of Using Surds, Rationalising the Denominator draft Daisy Lake 29/06/2021 11:52
Daisy's copy of Using Surds, Rationalising the Denominator draft Daisy Lake 05/07/2021 12:19
Miriam's copy of Using Surds, Rationalising the Denominator draft Miriam Krakovska 15/07/2021 16:00
Using Surds, Rationalising the Denominator draft Thanom Shaw 29/07/2021 09:40
Several surds questions draft Thanom Shaw 18/08/2021 04:14
Surds draft Kerry Brooks 02/09/2021 15:28
Kerry's copy of Using Surds, Rationalising the Denominator draft Kerry Brooks 02/09/2021 15:30
Surds: Multiplication Rule draft Kerry Brooks 10/09/2021 13:09
Surds: Division Rule draft Kerry Brooks 02/09/2021 15:47
Using Surds, Rationalising the Denominator Ready to use Anna Cartlidge 24/03/2022 10:23

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