Loading...
Error
There was an error loading the page.
Metadata
Taxonomy:
Contributors
History and Feedback
Chris Graham 2 years, 7 months ago
I've rewritten large parts of the advice, especially where visibility conditions were used, and utilised the random names extension to add some context to part b).
Chris Graham 2 years, 7 months ago
Gave some feedback: Ready to use
Elliott Fletcher 2 years, 7 months ago
Saved a checkpoint:
I have rewritten the step so that it includes the variables in the question and gaps asking the student to calculate the decimal multiplier for the decrease and the value after the first month and then after another month.
I have also added a precision hint for the answer in part a).
Elliott Fletcher 2 years, 7 months ago
Gave some feedback: Needs to be tested
Chris Graham 2 years, 7 months ago
This step could be specific to the question variables and gaps, perhaps asking for the decimal multiplier for the decrease, and then the first two month.
There are no precision hints given, though the students need to round to 2 decimal places.
Chris Graham 2 years, 7 months ago
Gave some feedback: Has some problems
Stanislav Duris 2 years, 7 months ago
Published this.Stanislav Duris 2 years, 7 months ago
Saved a checkpoint:
I hope this question won't need more huge adjustments, especially in part b, cause this part's advice was quite tricky to write and the answer is a bit tricky to calculate. I'll try to describe how the answer to part b) works:
 At first, a random number from 6 to 9 is picked (testn).
 Then pricee1 is calculated, which is the smartphone's value after testn months.
 Threshold is calculated, which is the crucial number in the question. This is the first multiple of ten higher than pricee1.
 We would normally be finished, but the numbers and percentages are not big enough so sometimes the decrease in the smartphone's value is less than 10, which means the smarphone's value one month before testn months may also be below threshold.
 We calculate the smartphone's value after testn1 months, this is pricee2.
 Finally, the correct answer is the variable n. This is either testn1, if pricee2 < threshold, or testn, if pricee2 > threshold.
Right now, pricee3 (the value after testn2 months) never falls below the threshold (thank god) so it is not used in the question at all. However, if there'll be some adjustments to the price or the percentages in the question, this may not be true anymore. Make sure it is still ALWAYS below the threshold and if not, adjust the variable "n" so sometimes it can also be testn2. I hope this is not too confusing and if it is, I hope no one has to deal with this anymore.
Stanislav Duris 2 years, 7 months ago
I have changed the part b) how you suggested so it's more natural. I have also separated part c) into its own question.
Stanislav Duris 2 years, 7 months ago
Gave some feedback: Needs to be tested
Stanislav Duris 2 years, 7 months ago
Gave some feedback: Has some problems
Christian LawsonPerfect 2 years, 7 months ago
Gave some feedback: Has some problems
Christian LawsonPerfect 2 years, 7 months ago
Saved a checkpoint:
Numbers in text should be in LaTeX, unless they're counting numbers, e.g. "two things". It's conventional to use words instead of digits when you're talking about a number of things or an ordinal, rather than a measurement. See this page from the BBC's style guide.
I've done some rewording in part a, and removed the statement  it was superfluous.
Part b is very artificial. A more natural question would be "after how many more months will the price fall below £xxx?", where the price is a multiple of £10.
Part c could be a separate question.
Stanislav Duris 2 years, 8 months ago
I've reworded the statement. I've also made all numbers display in LaTeX, but I am unsure about this, because I have been previously told not to do this for all numbers in text. How do we decide which numbers/variables to put in Latex and which ones to keep as text?
Stanislav Duris 2 years, 8 months ago
Gave some feedback: Needs to be tested
Vicky Hall 2 years, 8 months ago
Gave some feedback: Has some problems
Vicky Hall 2 years, 8 months ago
Make sure all number are in Latex. I think the statement needs changing
Check your tenses. For example, 'How much is it worth after 5 months?' would read much better as 'How much will it be worth after 5 months?'. Also, 'After how many more months is the smartphone's value going to be £511.19?' would be better as 'After how many more months will the smartphone's value be £511.19?'.
In part c), I would say leave out the word 'exponentially' and change the next sentence to say 'What was the average percentage increase per year?'.
Stanislav Duris 2 years, 8 months ago
Gave some feedback: Needs to be tested
Stanislav Duris 2 years, 8 months ago
Created this as a copy of Simple interest.Name  Status  Author  Last Modified  

Simple interest  Ready to use  Stanislav Duris  20/11/2019 14:42  
Cumulative percent decrease  Ready to use  Stanislav Duris  20/11/2019 14:36  
Exponential increase  Ready to use  Stanislav Duris  20/11/2019 14:38  
Ida's copy of Cumulative percent decrease  draft  Ida Landgärds  12/04/2018 10:54  
Spørsmål 4  draft  Ida Landgärds  09/01/2019 14:42  
haifa's copy of Cumulative percent decrease  draft  haifa abd  01/05/2018 14:20  
Consumer Arithmetic  Simple Interest  draft  Paul Hancock  24/07/2018 03:08 
No variables have been defined in this question.
This variable doesn't seem to be used anywhere.
Name  Type  Generated Value  

Error in variable testing condition
There's an error in the condition you specified in the Variable testing tab. Variable values can't be generated until it's fixed.
No parts have been defined in this question.
Select a part to edit.
Ask the student a question, and give any hints about how they should answer this part.
Pattern restriction
Variables
String restrictions
Answers  

Choices 
Test that the marking algorithm works
Check that the marking algorithm works with different sets of variables and student answers using the interface below.
Create unit tests to save expected results and to document how the algorithm should work.
There's an error which means the marking algorithm can't run:
Name  Value  

Note

Value  Feedback 


Click on a note's name to show or hide it. Only shown notes will be included when you create a unit test.
Unit tests
No unit tests have been defined. Enter an answer above, select one or more notes, and click the "Create a unit test" button.
The following tests check that the question is behaving as desired.
This test has not been run yet This test produces the expected output This test does not produce the expected output
This test is not currently producing the expected result. Fix the marking algorithm to produce the expected results detailed below or, if this test is out of date, update the test to accept the current values.
One or more notes in this test are no longer defined. If these notes are no longer needed, you should delete this test.
Name  Value 

Note  Value  Feedback  

This note produces the expected output  Current: 


Expected: 

This test has not yet been run.
When you need to change the way this part works beyond the available options, you can write JavaScript code to be executed at the times described below.
To account for errors made by the student in earlier calculations, replace question variables with answers to earlier parts.
In order to create a variable replacement, you must define at least one variable and one other part.
Variable  Answer to use  Must be answered?  

The variable replacements you've chosen will cause the following variables to be regenerated each time the student submits an answer to this part:
These variables have some random elements, which means they're not guaranteed to have the same value each time the student submits an answer. You should define new variables to store the random elements, so that they remain the same each time this part is marked.
to
This question is used in the following exams:
 Powers and indices by Christian LawsonPerfect in Transition to university.
 Money by Christian LawsonPerfect in Transition to university.
 maths practicerevision by David Martin in David's workspace.
 Questions using the random person extension by Christian LawsonPerfect in Christian's workspace.
 Powers and indices by Angus Rosenburgh in Angus's workspace.
 Powers and indices with functions by Mark Hodds in Tutoring.
 Exponential Applications by haifa abd in NEM1001.
 Eva's copy of Powers and indices by Eva Szatmari in Eva's workspace.
 Blathnaid's copy of Eva's copy of Powers and indices by Blathnaid Sheridan in Blathnaid's workspace.
 Huuuuuge test by Angus Rosenburgh in Angus's workspace.
 Nick's copy of Powers and indices by Nick Walker in Nick's workspace.
 Powers and indices [L0 Randomised] by Matthew James Sykes in CHY1205.
 PRELECTURE SKILLS by Matthew James Sykes in CHY1205.
 Examen 2 by Joël Cohen in Joël's workspace.
 Test 1 by Patricia Cogan in Patricia's workspace.
 Maria's copy of Powers and indices by Maria Aneiros in Maria's workspace.
 Numeracy practice test MN1105 RHUL by JoseRodrigo CordobaPachon in JoseRodrigo's workspace.
 More questions MN1105 by JoseRodrigo CordobaPachon in JoseRodrigo's workspace.
 Powers and indices by AJAY OTTA in AJAY's workspace.