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Chris Graham 2 years, 8 months ago
Gave some feedback: Ready to use
Chris Graham 2 years, 8 months ago
I've split off the prime numbers part into its own question and reused the variables from part a) in b) and c), so that the parts lead on from eachother.
Elliott Fletcher 2 years, 8 months ago
Published this.Lauren Richards 2 years, 8 months ago
In part c)i), ii) and iii), I really wanted the individual factors to be listed for each number, and then for the common factors in each individual list to be highlighted but I didn't know how to do this and I think Chris mentioned something would have to be created in order to do this.
Lauren Richards 2 years, 9 months ago
Gave some feedback: Needs to be tested
Chris Graham 2 years, 9 months ago
I had 25 marked as prime in part b). I think you may need to update the marking matrix after removing the choice below?
Chris Graham 2 years, 9 months ago
Gave some feedback: Has some problems
Lauren Richards 2 years, 9 months ago
Gave some feedback: Needs to be tested
Chris Graham 2 years, 9 months ago
Gave some feedback: Has some problems
Chris Graham 2 years, 9 months ago
I think I would avoid 1 as an option altogether in part (b). Whether 1 is prime or not will trip up a lot of students but is unlikely to be of importance in their studies; I think it's more important to test their knowledge of whether a number is or isn't composite, rather than catch them out on (arguably) a technicality.
RE your problem in the comment below: h/6 is less than 6 ~50% of the time, so you could either rethink your variables, or use
sort
to arrange into the correct order, for example set up a new list of numbers containing the factors...sort([1,2,3,h/6,6...]
).There's a mix of singular and plural in the statement. I think I would write "A number that can be...".
"divided evenly by whole numbers" would be better as "divided without remainder..." to avoid confusion with even numbers.
Part (c) in the advice does not provide much additional informtation. I guess you haven't included all of the factors as it would be a pain! That's fine I think.
Lauren Richards 2 years, 9 months ago
 There is a slight problem with variable h in the table in that sometimes its divisors are not in the right order.
Lauren Richards 2 years, 9 months ago
Gave some feedback: Needs to be tested
Elliott Fletcher 2 years, 9 months ago
Gave some feedback: Has some problems
Elliott Fletcher 2 years, 9 months ago
I think this is a really good question and it works well. Just a few comments
Main Parts
In the statement i would write a definition of composite as well as some students might not know what this means.
a) good
b) in the question i would write "Identify which of the following are prime numbers:" instead of "Identify the prime numbers from below."
One of the numbers here for me was 43, which is a prime number, however if you say it is a prime number it is marked incorrect as the displayed answer is that it is composite.
Advice
Good job getting the list of factors thing to work!
b) you could put the numbers in the table in the order that they appear in the question but it's up to you. I would also write "composite" instead of "not prime".
Also you could extend the table a little bit to the right, so that some numbers don't go onto a new line in the divisors column.
Lauren Richards 2 years, 9 months ago
Gave some feedback: Needs to be tested
Lauren Richards 2 years, 9 months ago
Gave some feedback: Has some problems
Lauren Richards 2 years, 9 months ago
Gave some feedback: Needs to be tested
Vicky Hall 2 years, 9 months ago
Also, the bit in the advice that says 'Whilst $1$ technically fits the criteria for a prime number, it is not considered a prime number' needs to be changed. $1$ does not meet the criteria for being a prime as it only divides by $1$, whereas all other primes have two distinct divisors, themselves and $1$.
Vicky Hall 2 years, 9 months ago
Gave some feedback: Has some problems
Vicky Hall 2 years, 9 months ago
I would change the title to 'Identifying prime numbers' to make it clearer what the question is about. In the question I would change the word 'composite' to 'not prime', just to make the language a bit simpler.
Lauren Richards 2 years, 9 months ago
Gave some feedback: Needs to be tested
Lauren Richards 2 years, 9 months ago
Created this.Name  Status  Author  Last Modified  

Finding the highest common factor of two numbers  Ready to use  Lauren Richards  20/11/2019 14:39  
Prime numbers  Ready to use  Chris Graham  20/11/2019 14:41  
ggd om breuken te vereenvoudigen  draft  Johan Maertens  30/11/2017 17:28  
Marlon's copy of Prime numbers  draft  Marlon Arcila  03/02/2018 16:22  
ibrahim's copy of Prime numbers  draft  ibrahim khatib  10/02/2020 15:40  
Identify prime/composite numbers  Ready to use  Madalyn Casey  29/03/2020 05:43 
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This question is used in the following exams:
 trial run by Lesley Davis in Lesley's workspace.
 Divisibility and factors of integers by Christian LawsonPerfect in Transition to university.
 maths practicerevision by David Martin in David's workspace.
 Nick's copy of Divisibility and factors of integers by Nick Walker in Nick's workspace.
 Blathnaid's copy of Nick's copy of Divisibility and factors of integers by Blathnaid Sheridan in Blathnaid's workspace.
 MATH1601 Quiz 1 by Blathnaid Sheridan in Blathnaid's workspace.
 Divisibility and factors of integers by Simon Thomas in Foundation mathematics.