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Elliott Fletcher 2 years, 1 month ago
Published this.Chris Graham 2 years, 2 months ago
Gave some feedback: Ready to use
Chris Graham 2 years, 2 months ago
I've made some very minor changes to the advice. Looks good now.
Lauren Richards 2 years, 2 months ago
Gave some feedback: Needs to be tested
Christian LawsonPerfect 2 years, 2 months ago
Gave some feedback: Has some problems
Christian LawsonPerfect 2 years, 2 months ago
Saved a checkpoint:
I've removed the "without a calculator" bit  I don't care how students add fractions, as long as they can do it!
The advice for parts b and c could be a lot shorter  say what's different from the previous part, how to deal with it, and then briefly show the working out.
Lauren Richards 2 years, 2 months ago
Gave some feedback: Needs to be tested
Lauren Richards 2 years, 2 months ago
Gave some feedback: Has some problems
Stanislav Duris 2 years, 2 months ago
I haven't noticed any major problems with this question, but I thought about a couple of ideas for slight adjustments.
 If you want the student to do this question without a calculator, don't you want to perhaps tell them not to use it in the question statement? You mention not using a calculator in advice but not in the question itself. Also, you tell them to simplify their answer twice in the question statement. I don't know if you've done this on purpose so they are more likely to notice it, or if this was a mistake.
 Maybe you can slightly adjust a name of this question since there is some multiplication in part c). But it does mainly focus on addition/subtraction so if it stays like it is it should be fine.
 It's a good idea to include the original question at the start of each part in the advice, but maybe it would be even nicer to use the
\[ \]
format to display it? And maybe also all lines in advice consisting entirely out of equations could be changed into that format. This would make it look a bit neater, since this topic requires a lot of steps and it may be easy to get lost in. Although this isn't the question with a main focus on GCD and LCM and I am not sure how you would write this in advice, I still think more advice (maybe just 1 or 2 general sentences with an example different from a question that wouldn't be with variables) on how to find these would help students with simplifying fractions since I think that is the big part of the question. However, if you have included this in some of your other questions about fractions, this isn't essential.
 Also, in Advice at the end of each part you wrote "Using this value to simplify, the final answer is ...", maybe specifying you're dividing both numerator and denominator with this value would help someone struggling with simplification and can't see how it works clearly.
 You keep using the plural form of denominator when saying "keeping the denominators the same"  I don't know if this is better than just using a singular as this is when the two denominators merge into one.
 In the numerator part, the third line consists of just a fullstop from the previous line. I know this will probably differ depending on the device the student is using, but if this is the standard layout it would be great if you could try to fix this somehow. It's a silly thing but it may be distracting. If it's displayed differently on each computer, I'm sorry and I'll shut up.
 When the greatest common divisor is 1 and there is no simplification needed, the last line "Simplifying using...." doesn't really make sense, so it could be changed to be conditionally visible only if gcd ≠ 1, if you're not sure how to do that I can help. However, it can often be very laggy to work with this and Numbas sometimes crashes when you do this, so it's up to you.
Ultimately I think this question does the job well. Good job designing/defining all the variables cause it looks tricky.
Lauren Richards 2 years, 2 months ago
I have enacted all the changes you suggested and particularly ensured that all the fractions in the question and advice will cancel down to their simplest form by making them all coprime.
Lauren Richards 2 years, 2 months ago
Gave some feedback: Needs to be tested
Vicky Hall 2 years, 3 months ago
Gave some feedback: Has some problems
Vicky Hall 2 years, 3 months ago
This question has largely the same issues as the other fraction questions I have already commented on. Have a look through and check that:
1) You're using \displaystyle where necessary.
2) There are no unsimplified fractions in the questions.
3) There are no unnecessary colons in the advice.
Lauren Richards 2 years, 3 months ago
Gave some feedback: Needs to be tested
Lauren Richards 2 years, 3 months ago
Created this.Name  Status  Author  Last Modified  

Addition and subtraction of fractions  Ready to use  Lauren Richards  01/08/2017 15:15  
JoAnn's copy of Addition and subtraction of fractions  Ready to use  JoAnn Lyons  14/01/2019 15:43  
surbhi's copy of Addition and subtraction of fractions  draft  surbhi gautam  14/01/2019 15:47 
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