Loading...
Error
There was an error loading the page.
Contributors
History and Feedback
Christian Lawson-Perfect 2 years, 8 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect 2 years, 8 months ago
Saved a checkpoint:
I've tidied up the text, and gone to town on the variables because they were crazy.
Elliott Fletcher 2 years, 8 months ago
Published this.Elliott Fletcher 2 years, 8 months ago
I have rearranged this question quite a bit.
I have made it a two part question, instead of just having one part asking you to find the partial sum of the sequence, as the steps would've been too long if it was just a one-part question and i think a lot of students would find this question difficult without some guidance.
The first part asks the student to calculate the term number of the last term of the sequence and then the second part asks the student to calculate the partial sum.
I have also rewritten the statement and the advice accordingly.
Elliott Fletcher 2 years, 8 months ago
Gave some feedback: Needs to be tested
Elliott Fletcher 2 years, 8 months ago
Gave some feedback: Has some problems
Hannah Aldous 2 years, 9 months ago
Gave some feedback: Needs to be tested
Christian Lawson-Perfect 2 years, 9 months ago
Gave some feedback: Has some problems
Christian Lawson-Perfect 2 years, 9 months ago
Saved a checkpoint:
Fixed a few typos...
You need to show the limits of the sum: $\sum_{i=1}^n$ instead of just $\sum$.
There are a couple of steps you need to carry out in order to work out the partial sum given a list of the elements:
- Identify $a_1$ and $a_n$.
- Calculate $n$.
These could be in Steps, to guide students through the calculation.
Similarly in part b), you need to identify the first term and common difference; these could be Steps.
You've put i) and ii) in the advice, but not in the question itself! And they're basically the same question, aren't they?
The advice uses $d$ for the common difference, but never introduces it. And if your first term is $a_0$ instead of $a_1$, the formula for $a_n$ is a lot nicer.
I don't like "We need to find the difference between $20 \rightarrow 30 \rightarrow 40$". That's not a sentence! I'd prefer something like "We need to find $d$, the common difference between consecutive terms in the sequence."
This could be split into two separate questions.
Hannah Aldous 2 years, 9 months ago
Gave some feedback: Needs to be tested
Hannah Aldous 2 years, 9 months ago
Created this as a copy of Arithmetic sequences in an ice cream shop.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:
- Sequences by Elliott Fletcher in Elliott's workspace.
- Arithmetic sequences by Christian Lawson-Perfect in Transition to university.
- Arithmetic sequences by steve kilgallon in Graphs and series.
- P12 - Series & Sequences by Rob Beckett in Rob's workspace.
- Arithmetic sequences by Simon Thomas in Maths support.