Christian Lawson-Perfect

Christian Lawson-Perfect on Using a speed graph to find distance 8 years, 5 months ago

Gave some feedback: Has some problems

Christian Lawson-Perfect on Using a speed graph to find distance 8 years, 5 months ago

Saved a checkpoint:

I've changed all the gaps to number entry parts.

Part d: "Given that the the total distance travelled over the $10$ second period $=$ $126$ metres" is not how I would state the distance travelled. I'd just write "The car travelled $126$ metres over the 10-second period."

I'd want the answer as a decimal, too. Since you're dividing by 10 it's always going to have just 1 decimal place, right?

Yet again, there's an "it's" instead of "its".

Christian Lawson-Perfect on Using a speed and acceleration graph 8 years, 5 months ago

Gave some feedback: Has some problems

Christian Lawson-Perfect on Using a speed and acceleration graph 8 years, 5 months ago

Saved a checkpoint:

What's the idea with part e? Without calculus, how do I answer it? I think the choices and answers are the wrong way round - you have two options for "no acceleration". I think looking at graphs is more appropriate at this level. Either way, it should be a separate question.

Christian Lawson-Perfect on Cumulative percent decrease 8 years, 5 months ago

Gave some feedback: Has some problems

Christian Lawson-Perfect on Cumulative percent decrease 8 years, 5 months ago

Saved a checkpoint:

Numbers in text should be in LaTeX, unless they're counting numbers, e.g. "two things". It's conventional to use words instead of digits when you're talking about a number of things or an ordinal, rather than a measurement. See this page from the BBC's style guide.

I've done some rewording in part a, and removed the statement - it was superfluous.

Part b is very artificial. A more natural question would be "after how many more months will the price fall below £xxx?", where the price is a multiple of £10.

Part c could be a separate question.

Christian Lawson-Perfect on Calculate the original price before a decrease 8 years, 5 months ago

Gave some feedback: Has some problems

Christian Lawson-Perfect on Calculate the original price before a decrease 8 years, 5 months ago

Saved a checkpoint:

Currently, the maximum price that can be picked is £800, and the maximum percentage change is 30%, giving a maximum original price of £1143. That's an enormous amount of money for a smartphone or a console! Maybe use a different range of prices for each item.

The "original" prices don't seem very realistic - they would typically be £xxx.99, just like the discounted price. Can you round off the original price, and make sure that the percentage discount is still the same?

Christian Lawson-Perfect on Square and cube numbers 8 years, 5 months ago

Gave some feedback: Has some problems

Christian Lawson-Perfect on Square and cube numbers 8 years, 5 months ago

Saved a checkpoint:

I don't think you need the $x_i$ notation. This question should test that the student knows what a superscript 2 or 3 means. This question could just be, "Find $5^2$"; "Find $3^3$"; "Find the first square number between $124$ and $165$".