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Checkpoint description

Describe what's changed since the last checkpoint.

Picture of Chris Graham

Chris Graham 2 years, 2 months ago

Gave some feedback: Ready to use

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Chris Graham 2 years, 2 months ago

I have shortened and tidied the advice. Looks good.

Stanislav Duris 2 years, 2 months ago

Published this.

Stanislav Duris 2 years, 2 months ago

Saved a checkpoint:

I hope this question is ready to use now. If not, I don't think I can provide any helpful comments for the person who picks it up, but I think (or hope) it would only need very slight adjustments.

Restore this checkpoint

Stanislav Duris 2 years, 2 months ago

Gave some feedback: Needs to be tested

Stanislav Duris 2 years, 2 months ago

I've changed the percentages to be multiples of 5 and adjusted the advice.

I believe the line in the advice about not rouding can be correct. This is because in case the third decimal place of the calculated discount is 5 and all the following decimal places are zeros (so it would be xxx.xx5), we would round up and therefore subtract this rounded up value. However, the shop would technically round this down as they calculate the price by simply multiplying the original price by the percentage and they would round up there, cause they would also get 5 as the third decimal place and the rest would be zeros. So rounding the discount results in an error of 1 penny in some cases

This happened on occasions with previous percentages but seems not to happen anymore with multiples of 5 so I removed that line.

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Christian Lawson-Perfect 2 years, 2 months ago

Gave some feedback: Has some problems

Picture of Christian Lawson-Perfect

Christian Lawson-Perfect 2 years, 2 months ago

Saved a checkpoint:

I don't think anyone in the history of shopping has had a voucher for a 12% discount. Pick multiples of 5%.

The line in the advice about not rounding until the end is incorrect - in this instance you can round off the discount before subtracting it from the original price. If you were subtracting two discounts, or performing a further calculation with the discounted price, you might encounter problems. 

"This does not make sense in the real world" needs to be more precise - something like "The shop would round this discount to the nearest penny" would do.

I don't think I agree with "Method 1 is a bit simpler and more appropriate to use." - simplicity is in the eye of the beholder! Just briefly describe each method instead: "the first method involves working out the discounted price as a percentage of the original, while the second method calculates the value of the discount and subtracts that from the listed price."

Restore this checkpoint

Stanislav Duris 2 years, 2 months ago

Thank you. A warning message was a good suggestion so i've included it now.

Stanislav Duris 2 years, 2 months ago

Gave some feedback: Needs to be tested

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Bradley Bush 2 years, 2 months ago

Gave some feedback: Has some problems

Picture of Bradley Bush

Bradley Bush 2 years, 2 months ago

Very good, straight forward question so only a few minor ideas:

  • I know you've said it in the advice but you probably should specify that you want rounding to 2 decimal places (or the nearest penny) particularly because sometimes shops will round up the cost of an item etc.
  • If you were able to, a warning message that explains the figure needs to be rounded to 2.d.p might be really useful for cases where students have put the full length answer in.
  • On the rounding note, in the advice, it would probably be useful to have the full non-rounded answer then have a extra step where the figure is rounded to 2.d.p.
  • I think that it is very thorough that you've included both methods of finding the solution using both fractionas and decimals aswell, so well done for that.

Really good question overall

Stanislav Duris 2 years, 3 months ago

Gave some feedback: Needs to be tested

Stanislav Duris 2 years, 3 months ago

Merged Calculate a student discount

I am separating the original question into multiple smaller questions.

Vicky Hall 2 years, 3 months ago

Gave some feedback: Has some problems

Vicky Hall 2 years, 3 months ago

Sorry, the final sentences are meant to read:

To find $25$% we can multiply by $0.25$. To increase something by $10$%, we can multiply by $1.1$. 

Vicky Hall 2 years, 3 months ago

Parts b) and d) are testing subtraction rather than percentages so remove these parts. If you wanted to bulk out questions you could combine the ideas in parts a), c) and d) into a single question. Some questions giving the new price after the percentage change and asking students to calculate the old price would be good here to demonstrate that it matters which number you take the percentage of (this often confuses students). It would also be a good idea to have students calculate the percentage change bewteen two prices.

In the advice, I would include mulipliers as one of your possible methods for calculating percentages. For example, to find $25%$ we can mulitply by $0.25$. To increase something by $10%$, we can multiply by $1.1$.

Stanislav Duris 2 years, 3 months ago

Gave some feedback: Needs to be tested

Stanislav Duris 2 years, 3 months ago

Created this.
Name Status Author Last Modified
Calculate a student discount Ready to use Stanislav Duris 01/08/2017 14:30
Stanislav's copy of Calculate decreasing and increasing costs using percentages needs to be tested Should not be used Stanislav Duris 22/06/2017 14:27
Calculate a student discount Should not be used Stanislav Duris 22/06/2017 16:19
Calculate the original price before a decrease Ready to use Stanislav Duris 14/08/2017 12:24
Consumer Arithmetic - Calculate the original price before a decrease draft Paul Hancock 24/07/2018 02:53

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