6 questions which introduce the user to the Numbas system.
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\nThis is the first part and contains one question for you to answer. It will be clear from the question what you need to enter in each field.
\nFor example, a question could be:
\n$2+2=\\;$[[0]] (enter a number)
\nYou are expected to enter the answer and then press the Submit part button. Try it. Enter the correct value and press Submit part - a tick appears. Brilliant!!
\nNow enter an incorrect value. Press Submit part and a cross appears. Note the feedback underneath the button - in this case there is not much to say!
\nThis is the sort of feedback you get in practice mode.
\nTry putting in 2+2 as your answer and see what happens as well. You will be given an error message; click on OK and continue. So you must be careful and always check that the answer in the input field is what you expect it to be before you move on.
Pressing the Reveal answers button gives you the answers for all parts and usually also gives you a full solution for each part. This is only available in practice mode and certainly not available in a real assessment.
\nAlso note that in practice mode you have available a button at the bottom, Try another question like this one. This is useful for you to try other versions of the question. This question is not randomised, so you will get the same one back again!
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\nNote that your input in mathematical notation is displayed next to your input so you can check it has been interpreted correctly.
\n$x+x=\\;$[[0]] (Enter a multiple of $x$ )
\nEnter your answer as 2*x. You could just enter 2x without the * for all multiplications as there are some cases where it is necessary in order to avoid ambiguity.
Simplify the following expression. Once again you see your input rendered in the best possible mathematical notation next to where you type. This check becomes more important when you input more complicated expressions.
\n$2x-x+y-2y=\\;$[[1]]
\nTry getting one right and one wrong and see the sort of feedback you get (the grey tick indicates that you have some, but not all, of the available marks). Also try inputting x+x for the answer to the first question in this part and see what happens after you submit.
Note the red exclamation marks next to the input field when you enter something the system does not like or you have pressed Submit part without answering the question. Move the cursor over the mark and you will get a message saying what the problem is.
\nThe Submit all parts button at the bottom allows you to answer everything in the question at once without submitting each part separately. In this case, the answers in both parts will be submitted.
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\nThis example and the others are in practice mode - you will be given information on whether or not you have the answer correct or not.
\nIf you use Numbas for a real assessment, it does not give you this information.
\nIt is very important that you submit all your answers. If you do not your results will not be recorded. Note that the list of questions in the exam on the left of the window gives information on whether or not you have completed a question.
\nGo to the next question. You can then come back. Note that until you quit the exam for good you can go back to any question and change your answers if you want to.
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\n$\\var{a}\\times\\var{b}+\\var{c}=\\;$[[0]]
\nYou have to input a whole number - it could be in decimal form. If the answer was $2$ then you could input 2 or 2.0 - try both forms.
Decimals
\nMany calculations will result in numbers which need to be entered in decimal notation, and the question will ask for a certain number of decimal places.
\nOften there is a small tolerance built in so that if you get the result wrong by 1 in the last decimal place then it will be marked as correct. But accuracy is important, so make sure that you get the calculations correct.
\nFor example:
\nInput $\\displaystyle \\frac{\\var{a1}}{\\var{b1}}$ as a decimal correct to 2 decimal places here: [[0]]
\nTry entering the correct value and submitting. Then vary the last decimal place by 1 either way and submitting, and then the last place by 2 either way and submitting.
\nTry putting in the fraction as it is (i.e. $\\var{a1}/\\var{b1}$ ) and see what happens.
\nThe system gives an error message as what you have put in is not a direct representation of a number. But you can always re-enter.
\nSo be careful - always check after submitting your answer that the input field contains the answer that you thought you entered.
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\nYou will find that some questions may ask you to input fractions and not decimals.
\nFor example, find the following sum as a fraction:
\n$\\displaystyle \\frac{1}{\\var{a1}}+\\frac{1}{\\var{b1}}=\\;$[[0]]
\n(input as a fraction and not a decimal)
\nHint: the answer is {a1+b1}/{a1*b1}
\nTry inputting the decimal version of this to as many places as you like (for example given by the calculator on the PC - you can copy this from the calculator and paste into the input field) and see what happens.
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\nFinally as you are in practice mode, if you click on the Try another question like this one button at the bottom you will get this question again but with different numbers (usually!), and you can try it again. This is true for all practice mode questions which are randomised.
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\nDetails on inputting numbers into Numbas.
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