Numbas demo questions for NUTELA meeting, December 2017.

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Some questions to show off features of Numbas, linked from the Numbas homepage.

Some questions demonstrating new features in Numbas v4.0: pattern-matching, inference of variable types in mathematical expression parts, and marking equations.

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.

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.

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.

Utilizza un grafico di una retta $y=mx+c$ incluso da Geogebra con coefficienti casuali impostati da NUMBAS. Il grafico contiene anche un punto $P$ di coordinate casuali impostate da NUMBAS. L'esercizio chiede di determinare l'equazione della retta e quelle delle rette parallela e perpendicolare per $P$.

A sneak peek at a really clever integration of GeoGebra with Numbas.

Numbas representation of the Metacentric Height fluid mechanics laboratory for first year Engineering students. 

Students should answer this question after completing the laboratory and the associated Excel template, including the relevant plots. 

The first question tests their capacity to correctly calculate metacentric heights, the remaining questions evaluate their graph interpretation skills. 

Practice with adding, subtracting and dividing basic algebraic fractions

Update: you can now use the conditional visibility button to do this more easily - see the documentation.

If the statement or advice for your question differs greatly depending on a random variable (for instance, if you're picking from a selection of scenarios), you only want to show content for the relevant scenario.

This question shows one way of doing that.

This question is out of date: use the currency function instead.

Display a number like "1234" as "1,234".

This question is out of date: the formatnumber function can format numbers using several different notational styles.

Numbas can now understand and use several different styles of notation for numbers.

This question shows off all the supported styles, both for display in text and in the answers to number entry parts.

Construct a line in a GeoGebra worksheet by writing its definition string by hand.

This isn't a very neat way of doing this. It's easier to define two points in GeoGebra, then make a line through those points. You can set the positions of the points from Numbas using vectors.

Entering numbers in Numbas, Part 1.

Details on inputting numbers into Numbas.

Inputting algebraic expressions into Numbas.

Dealing with functions in Numbas.

Details on inputting numbers into Numbas.

Entering numbers and algebraic symbols  in Numbas.

Given the gradient of a slope and the coefficient of friction for a mass resting on it, use the equations of motion to calculate how it moves.

Includes a GeoGebra rendering of the model.

This uses an embedded Geogebra graph of a line $y=mx+c$ with random coefficients set by NUMBAS.

Details on inputting numbers into Numbas.

This question is out of date: use the currency function instead.

5 questions which introduce the student to the Numbas system.

rebelmaths

5 questions which introduce the student to the Numbas system.

rebelmaths

All the answers in this question are equations. In order to mark each equation, Numbas needs to pick some values that satisfy the equation and some that don't, and check that the student's answer agrees with the expected answer.

Any equation with the same solution set as the expected answer will be marked correct.