aij  notation and definition of the order of a matrix.

This shows how to define a question variable whose value is a variable name with a few annotations added, so it's more convenient to use.

The question variable 'x' is defined to be the variable name vec:underline:x.

Application of the binomial distribution given probabilities of success of an event.

Finding probabilities using the binomial distribution.

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Determine the correct interval notation for various sets.

Questions used in a university course titled "Group theory".

The questions deal with permutations written in cycle or two-line notation.

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Questions which try to emphasise that f(x) does not mean f times x.

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This question is out of date: the formatnumber function can format numbers using several different notational styles.

Putting a pair of linear equations into matrix notation and then solving by finding the inverse of the coefficient matrix. 

The student must enter a number in scientific notation, with separate boxes for significand and exponent. They only get the marks if both elements are correct.

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.

This question shows how to ask for a number in scientific notation, by asking for the significand and exponent separately and using a custom marking algorithm in the gap-fill part to put the two pieces together.

Answers not in standard form, i.e. with a significand not in $[1,10)$, are accepted but given partial marks.

Find a regression equation given 12 months data on temperature and sales of a drink. 

Enumerate the elements in some sets defined using set builder notation.

Some more questions on set theory - covering set builder notation, cartesian products, complements.

Find a regression equation given 12 months data on temperature and sales of a drink. 

Represent a given probability to a decimal, fraction or percentage.

This question shows how to ask for a number in scientific notation, by asking for the significand and exponent separately and using a custom marking algorithm in the gap-fill part to put the two pieces together.

Answers not in standard form, i.e. with a significand not in $[1,10)$, are accepted but given partial marks.

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Represent a given probability to a decimal, fraction or percentage.

Determine a finite sum and a limiting sum of a geometric series written using sigma notation. I'm not sure how to eliminate rounding errors...

Students seem to struggle with Sigma notation, this is about the easiest question possible for sigma notation.

Students seem to struggle with Sigma notation, this is about the easiest question possible for sigma notation.

Students seem to struggle with Sigma notation, this is about the easiest question possible for sigma notation.

Students seem to struggle with Sigma notation, this is a simple question to ensure they understand the index can change without affecting the sum.