Elliott Fletcher- Numbas at mathcentre.ac.uk

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Elliott Fletcher commented on Creating Frequency Tables 7 years, 4 months ago

I tried to use variables for this question, but i'm not really sure it's possible.

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Elliott Fletcher on Creating Frequency Tables 7 years, 4 months ago

Gave some feedback: Needs to be tested

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Elliott Fletcher created Creating Frequency Tables 7 years, 4 months ago

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Elliott Fletcher commented on Decimals to fractions 7 years, 4 months ago

This all looks pretty good, i just have a few suggestions.

Main Parts

a) iii) For a recurring decimal, you could use a handy piece of notation to avoid writing something like 0.6666...

using 0.\dot{6}, you can write the 6 with a dot above it which is the common notation for a recurring decimal. If you do want to use this i would also put a note in the statement saying 0.\dot{6} means 0.666...

Advice

On the first line you say "to convert a fraction into a decimal" whereas this should be "to convert a decimal into a fraction". I also think in this opening paragraph that you should say that you are multiplying the numerator and the denominator of this fraction by 10 instead of just saying that you multiply the whole fraction by 10.

a) iii) I don't think this is really enough of an explanation for how you convert a recurring decimal to fraction. I think there is actually a different method for converting recurring decimals to fractions, see the following link: http://studymaths.co.uk/topics/convertingRecurringDecimalsToFractions.php

a) iv) you haven't entered the decimal that you are converting to a fraction underneath the iv) here as you have with the other questions.

Otherwise, i think this is a good question!

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Elliott Fletcher on Decimals to fractions 7 years, 4 months ago

Gave some feedback: Has some problems

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Elliott Fletcher commented on Combining Logarithm Rules to Solve Equations 7 years, 4 months ago

This is a really good question, i just have a couple of comments

Main Parts

a) and b) i would use a \displaystyle before the fractions in the questions to make the fractions look bigger.

Advice

a) in the very last calculation when you are factorising the quadratic, you write the constant term as a power of a different number like 4^3, i would just leave this as it's simplified number, e.g

x^2-30x-4^3 = 0 could be x^2-30x-64 = 0

b) There is a random ' after the ln on the first line here

I think you are just missing a few full stops after some equations. Specifically, the one before "We then just need to rearrange our equation" and the very last line where you give the final value of x.