643 results authored by Christian Lawson-Perfect - search across all users.
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The matrix entry part in this question marks any symmetric matrix as correct, using a custom marking algorithm. A matrix is symmetric if it is equal to its transpose.
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Demonstration of the written number extension, which converts whole numbers to words.
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Calculate the concentration of a dilute acid given the amount and concentration of dilute alkali to neutralise it. Cribbed from this Bitesize problem.
There are steps to break down the calculation, and the student must give units at each step.
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Use the testing tab in the variables section to make sure the generated variables satisfy a condition
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This question loads an extension which contains a dataset in JSON format. The data is made available as a JME variable called 'animal_data'.
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A quick implementation of certainty-based marking: the student's score depends on how they rated their certainty in their answer before submission.
Because Numbas doesn't allow negative marking at the moment, scores are shifted upwards, so a high certainty incorrect answer scores 0, and a high certainty correct answer scores full credit.
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Choose from one of several pre-defined scenarios, and set variables to the corresponding values.
This question has three variables:
city,population, andpercent_like_chocolate. These differ for each city. -
A collection of questions to show off at a workshop for the North East and Yorkshire sigma hub, June 2016.
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Some questions to show off features of Numbas, linked from the Numbas homepage.
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Three equilateral triangles are divided equally into 3, 4 and 5 parts respectively. Calculate the distance between two marked points.
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Taken from question 37 of the book Problem Solving in GCSE Mathematics by Daniel Griller.
Given bearings and lengths of two straight lines, work out the bearing and distance back to the starting point.
A Eukleides diagram shows the setup visually.
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A collection of questions to show off at a workshop for Newcastle's LTDS, June 2016.
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Some questions which demonstrate the adaptive marking feature.
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A couple of questions demonstrating the use of the Eukleides extension to create geometrical drawings.
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Some questions to show off features of Numbas, linked from the Numbas homepage.
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Some questions demonstrating new features in Numbas v4.0: pattern-matching, inference of variable types in mathematical expression parts, and marking equations.
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This question contains several mathematical expression parts which only compare part of the student's answer with the corresponding part of the expected answer, because the expression can't be evaluated as a whole.
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In this question, the correct answers can't be evaluated by substituting numbers for each of the variables.
Numbas can now infer the types of variables in the answers to mathematical expression parts, so questions like this can be marked.
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The student is asked to enter an approximation to $\sqrt{n}$, where $n$ is not a square number, to 20 decimal places.
This question is a demonstration of the high precision arithmetic in Numbas v4.
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The student is asked to give the Avogadro constant in scientific form, calculate the mass of a number of moles of carbon, in grams, and then calculate the number of molecules in that mass.
This is a demonstration of the high-precision decimal arithmetic in Numbas v4.0.
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An interactive experiment about probability: the student must first 'design' the experiment by deciding how many times they're going to flip a coin, and define what number of heads would make them believe the coin is biased. They must then enter the results of their coin flips, calculate the percentage of heads, and finally decide if the coin is biased, using the condition they specified in the design stage. There are optional hints at each stage.
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An example of an iterative procedure: the student must factorise a given number. At each step, they're asked if the number is factorised. If not, they must give a prime factor. If it is fully factorised, they can then work out the number of factors of the number.
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This question demonstrates how to use explore mode to simulate a game, where each choice made by the student changes the state of the game.
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This question shows how to reveal a part if the student enters an incorrect answer that you're expecting - in this case, by not following the order of operations.
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This question demonstrates how to lock a part in explore mode after moving to the next part, to prevent the student changing their answer and invalidating the rest of the question.
