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Christian Lawson-Perfect 2 years, 1 month ago
Gave some feedback: Ready to use
Christian Lawson-Perfect 2 years, 1 month 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, 2 months ago
Published this.Elliott Fletcher 2 years, 2 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, 2 months ago
Gave some feedback: Needs to be tested
Elliott Fletcher 2 years, 2 months ago
Gave some feedback: Has some problems
Hannah Aldous 2 years, 2 months ago
Gave some feedback: Needs to be tested
Christian Lawson-Perfect 2 years, 2 months ago
Gave some feedback: Has some problems
Christian Lawson-Perfect 2 years, 2 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, 3 months ago
Gave some feedback: Needs to be tested
Hannah Aldous 2 years, 3 months ago
Created this as a copy of Arithmetic sequences in an ice cream shop.No variables have been defined in this question.
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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 Rebelmaths and similar.