Transition to university

Stanislav Duris on Rounding numbers to a given number of significant figures 8 years, 6 months ago

Gave some feedback: Needs to be tested

Lauren Richards commented on Fraction multiplication 8 years, 6 months ago

Thank you for the feedback. I have enacted your suggestions and corrected the mistakes. 

Lauren Richards on Fraction multiplication 8 years, 6 months ago

Gave some feedback: Needs to be tested

Vicky Hall on Inverse and composite functions 8 years, 6 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Inverse and composite functions 8 years, 6 months ago

The expected answers are not simplifed here. For example, I entered $\displaystyle \frac{x+6}{10}$ (which was marked as correct) but the expected answer displayed as $\displaystyle \frac{\frac{x-2}{2}+4}{5}$. This is the same in the advice, except here the answer displays as $\displaystyle ((x-2)/2+4)/5$, which is a nightmare to read! Have the advice display the solution in its simplest form and use \frac.

Vicky Hall commented on Fraction multiplication 8 years, 6 months ago

I would change the staement to say something like 'evaluate the following multiplications, giving each fraction in its simplest form'.

In part b), the expected answer is incorrect. When I tried it, the fraction in its lowest terms was $\displaystyle\frac{81}{104}$ but the expected answer said $\displaystyle\frac{162}{208}$. The correct answer appears in the advice though.

In part c) the fractions $\displaystyle\frac{3}{7}$ and $\displaystyle\frac{1}{3}$ should be variables. I know you've picked these numbers so that the answer always comes out as a whole number of days, which of course it must, but it would be much better to get Numbas to produce the variables so that the sum will always work out nicely, otherwise students can only do the question once. Also, display these fractions using \frac.

In the advice, you tend to use colons before stating a result. For example, '...final answer is: $\displaystyle\frac{81}{104}$'. You don't need the colon here, just give the number.

Vicky Hall on Fraction multiplication 8 years, 6 months ago

Gave some feedback: Has some problems

Lauren Richards on Fraction multiplication 8 years, 6 months ago

Gave some feedback: Needs to be tested

Vicky Hall on Use formulae for the area and volume of geometric shapes 8 years, 6 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Use formulae for the area and volume of geometric shapes 8 years, 6 months ago

I meant to link all formulae to the question so that the student understands why they have been given a particular formula. When asking them to calculate the volume of a tennis ball, tell them that you are providing the formula for the volume of a sphere. Hopefully this will help them to learn the correct formulae at the same time as practising substition.

Ensure that in all formulae the words 'Area' and 'Volume' are in Roman and also use \displaystyle to make the formulae clearer. Use $\sin C$ instead of $sin(C)$. 

It's not necessary to state the value of $\pi$ (and certainly not after every part of the question!) as the student will be using their calculator for these questions anyway. 

Please remember full stops at the end of all sentences.

Most of these comments also apply to 'Substitutuion without geometry' as well so please have a check through that too.

Aiden McCall on Use formulae for the area and volume of geometric shapes 8 years, 6 months ago

Gave some feedback: Needs to be tested

Bradley Bush on Inverse and composite functions 8 years, 6 months ago

Gave some feedback: Needs to be tested

Bradley Bush commented on Extract common factors of polynomials 8 years, 6 months ago

I have made tha change now and the question is working but I was actually looking for a way to have a and b as a random vector of primes with b=(reapeat(random([1,2,3,5,7,11,13...] except a[i])),(Is there a way to code for this?). I instead ended up manually creating lists for a and b where every other prime was in a and the others were in b. Is there a way to code for this? Thank you! 

Christian Lawson-Perfect commented on Extract common factors of polynomials 8 years, 6 months ago

When b is a list, random(something except [b]) will exclude the list containing the list b, not each element of b. So the square brackets are wrong - you want random(something except b).

Aiden McCall on Substitute values into formulas 8 years, 6 months ago

Gave some feedback: Needs to be tested

Vicky Hall on Use formulae for the area and volume of geometric shapes 8 years, 6 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Use formulae for the area and volume of geometric shapes 8 years, 6 months ago

In part c), you have mixed up the values of $r$ and $h$ in the solution. I would also change the possible values of $r$ and $h$ so that $h$ is always greater than $r$, because the diagram makes it look as though this is the case.

Link the formulae you are stating to the questions you are asking. For example, in part a), reword the question to say: 'Calculate the area of the frisbee given that the area of a circle is $\mathrm{Area}=\pi r^2$. Part d) needs to be reworded as the current prompt doesn't make sense and has 'cm' randomly placed in the sentence.

Remember full stops at the end of all sentences and at the end of the statement. If the formula is the end of your question, put the full stop after that. 

In the advice section there are issues with a few of the solutions. In part a), the penultimate line of working is correct but the final line gives a totally different number. In part c), $r$ and $h$ are mixed up like they were in the expected answer to the question. And in part d), the solution isn't rounded in the final line of working, as you've done in all of the other sections. 

Aiden McCall on Use formulae for the area and volume of geometric shapes 8 years, 6 months ago

Gave some feedback: Needs to be tested

Hannah Aldous on Using the Logarithm Equivalence $\log_ba=c \Longleftrightarrow a=b^c$ 8 years, 6 months ago

Gave some feedback: Needs to be tested