Chris Graham

Chris Graham commented on Square and cube numbers 8 years, 4 months ago

This is OK. I'm not sure if we wrote an always/sometimes/never question, but if we didn't then it would be an excellent addition.

Chris Graham on Exponential increase 8 years, 4 months ago

Gave some feedback: Has some problems

Chris Graham commented on Exponential increase 8 years, 4 months ago

Too many decimal places are retained in the advice.  In two places (step and advice), $x$ is referred to as the "percentage multiplier". Unless I'm out of touch with the terminology, I would call this a decimal multiplier.

Chris Graham commented on Cumulative percent decrease 8 years, 4 months ago

This step could be specific to the question variables and gaps, perhaps asking for the decimal multiplier for the decrease, and then the first two month.

There are no precision hints given, though the students need to round to 2 decimal places.

Chris Graham on Cumulative percent decrease 8 years, 4 months ago

Gave some feedback: Has some problems

Chris Graham on Finding the formula for the $n^{\text{th}}$ term of linear sequences 8 years, 4 months ago

Gave some feedback: Has some problems

Chris Graham commented on Finding the formula for the $n^{\text{th}}$ term of linear sequences 8 years, 4 months ago

Same issue here with "The amount of numbers in a sequence". Can you re-write anywhere else that we have this phrase please?

Chris Graham on Partial sum of an arithmetic sequence - birthday money 8 years, 4 months ago

Gave some feedback: Has some problems

Chris Graham commented on Partial sum of an arithmetic sequence - birthday money 8 years, 4 months ago

Ok, so we'e basically torn up and re-written the original question... This looks good, however as for previous questions on arithmetic series, can we have a table of the values and differences in the advice to part (a) please.

I would change "by his" in the statement to "after his", as it implies the amount before he receives money on his birthday. I know that you state that it includes the amount after, but this appears contradictory.

I'm not keen on $n$ being "the amount of numbers in a sequence". So if you have 10 terms in the sequence but you're calculating the $a_5$ term, do you still use $n=10$? "Term number" is terminology that is often used.