Chris Graham

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

I have changed "percentage multiplier" to "decimal multiplier" in the step and advice. Also changed the advice so that the percentage change is calculated first. Asking the student to multiply by 100 then subtract 100 in one step meant that they skipped completely the idea of, say, a 108% change in the value. 

I've removed some variables which were strange / not required.

Chris Graham on Use speed and distance to calculate time 8 years, 4 months ago

Gave some feedback: Needs to be tested

Chris Graham commented on Use speed and distance to calculate time 8 years, 4 months ago

I have reworded the advice as per my own suggestion.

Chris Graham on Find the equation of a line through two points - positive gradient 8 years, 4 months ago

Gave some feedback: Needs to be tested

Chris Graham commented on Find the equation of a line through two points - positive gradient 8 years, 4 months ago

This was a bit of a mess, as the points A and B had originally been illogically ordered, and this had only been half fixed. 

Part a) had mathematical expression gaps which should have been number entry, and I have added fractionNumbers simplification in the advice and displayed answer.

I've adjusted the axis ranges so that the intercept is always on the grid.

Chris Graham commented on Calculate density given mass and volume 8 years, 4 months ago

I've added some context to the question.

Chris Graham on Calculate density given mass and volume 8 years, 4 months ago

Gave some feedback: Needs to be tested

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

I've rewritten large parts of the advice, especially where visibility conditions were used, and utilised the random names extension to add some context to part b).

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

Gave some feedback: Ready to use

Chris Graham on Find the equation of a line through two points - negative gradient 8 years, 4 months ago

Gave some feedback: Ready to use