Vicky Hall

Vicky Hall on Factorising Quadratic Equations with $x^2$ Coefficients of 1 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall on Using a speed and acceleration graph 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Using a speed and acceleration graph 7 years, 5 months ago

You need to shift the $x$ axis up so it joins the $y$ axis at $(0,0)$. The graph looks very unusual with the $x$ axis where it is and it also makes it hard to see that some of the accelerations are negative. I also think that it would look better to have speed on one graph and acceleration on another. You could still ask the student to idenitfy which graph is which.

Make sure $\mathrm{metres}$ is spelt the English way.

I think $3$ questions on finding the distance is excessive - one where the area under the graph is a rectangle and another where it is not would suffice.

Currently the final part of the question just requires the student to add lots of numbers together. A better question would be to give them the distance travelled over the time periods they haven't yet calculated and ask them to calculate the average speed over the full time period. 

I actually think this could become two questions, one that looks at using a speed-time graph to find distance and one that looks at the relationship between speed and acceleration, as it is a long question assessing many aspects of the topic. It could also be good to encourage the student to think about what the speed-time graph will look like if the acceleration is not constant.

Vicky Hall on Creating Frequency Tables 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Creating Frequency Tables 7 years, 5 months ago

I was just wondering that about the the variables Elliott. I'm not sure how to do it but Chris or Christian may be able to. The only other thing I would do is put commas in your list of numbers to separate them a bit more clearly.

Vicky Hall commented on Finding the highest common factor of two numbers 7 years, 5 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 on Finding the highest common factor of two numbers 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Finding the highest common factor of two numbers 7 years, 5 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.

Vicky Hall on Relative Frequency 7 years, 5 months ago

Gave some feedback: Has some problems

Vicky Hall commented on Relative Frequency 7 years, 5 months ago

In part b), I would use metric units of measurement rather than imperial. Perhaps reword the question to say: the relative frequency of a student being taller than $y\mathrm{cm}$ is known to be $x$. The final row of the table in part c) slightly out of sync with the other rows.