Vicky Hall

Vicky Hall on Always, sometimes or never: square and cube numbers 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall on Simple interest 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Quadrant coordinates MCQ 7 years, 5 months ago

I have swapped the $x$ and $y$ part b) of the advice so it says:

$X$ axis when the $y$ coordinate of the point is zero.

$Y$ axis when the $x$ coordinate of the point is zero.

Vicky Hall commented on Simple interest 7 years, 5 months ago

I think this should be split into two questions, one on simple interest calculations and the other on compound interest calculations (which I would actually call exponential increase and decrease - if you consider your mobile phone question, there is no interest involved).

The question on exponential increase and decrease could potentially have three subparts to fully cover the subject. The first part would be the mobile phone question as it stands. Secondly, you could ask after how many months will the phone be worth £$x$? Thirdly, if a different phone was originally worth £$y$ and after $z$ months it is worth £$w$, by what percentage did its value decrease each month?

In the steps for calculating compound interest, it would be better to finish by showing that if we decrease something by $5$% three times, this is the same as multiplying by $0.95\times0.95\times0.95=0.95^3$. Showing students how to work with powers could save them a lot of time if the increase/decrease needs to be performed several times, plus it gives them a way to solve variations on the question.

Vicky Hall commented on Rationalising the denominator - surds 7 years, 5 months ago

I've fixed the variables so that part e) will simplify if it needs to in the advice. I also changed the variables slightly in part b) to avoid ever having square numbers under the roots. 

Vicky Hall on Expansion of brackets 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Expansion of brackets 7 years, 5 months ago

I agree with Christian that a better statement would be:

Expand the expressions below by multiplying each of the terms inside the brackets by the term outside. Give each answer in its simplest form.

Having the 'simplest form' prompt in the statement will save you having to repeat it in every part of the question. 

The questions get progressively more difficult but you essentially have two of each question, which seems unnecessary and makes the page look very long. If a student really wanted to do a particular type of problem multiple times, they could just refresh the page.

Have a check that your advice headers are in heading 4. There are also some typos in the advice.

Vicky Hall on Addition and subtraction of fractions 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Addition and subtraction of fractions 7 years, 5 months ago

This question has largely the same issues as the other fraction questions I have already commented on. Have a look through and check that:

1) You're using \displaystyle where necessary.

2) There are no unsimplified fractions in the questions. 

3) There are no unnecessary colons in the advice.

Vicky Hall on Using BODMAS to evaluate arithmetic expressions 7 years, 5 months ago

Gave some feedback: Has some problems