Combination

The goal of is this task is to calculate the numeric combination $\binom{n}{k}$, also known as n choose k. In the total field you fill in the total size n of the set of items, in the select field you fill in the number k items to select. So to calculate $\binom{4}{2}$, you fill in 4 in the total field and 2 in the select field.

Factorial

The goal of this task is to calculate the factorial $n!$ of a natural number n. You can filled in the natural number in the number field.

Greatest Common Divisor

The goal of this task is to calculate the greatest common divisor of two or more numbers. By default, the number 1 and number 2 fields are present. To add more number fields, you click on the + sign at the left of a number field. If you have more than two number fields and you want to remove a specific number field, you can click on the corresponding remove button on the left.

Least Common Multiplier

Within the Numerical task, you can find the Least Common Multiplier task. The goal of this task is to calculate the least common multiplier of two or more numbers. By default, the number 1 and number 2 fields are present. To add more number fields, you click on the + sign at the left of a number field. If you have more than two number fields and you want to remove a specific number field, you can click on the corresponding remove button on the left.

Round

Round Up

The goal of this task is to round a specific number up. You can fill in this number at the expression field. This task supports step-by-step guidance for students to hint that the number should be rounded up.

Round Down

The goal of this task is to round a specific number down. You can fill in this number at the expression field. This task supports step-by-step guidance for students to hint that the number should be rounded down.

Write decimal number as a fraction

The goal of this task is to write a specific decimal number as a fraction. You can fill in this decimal number at the number field. Both mixed fractions and basic fractions will be correct, unless specific otherwise using a mode. The correct answers to the below example with decimal number $1.2$ are $1 \frac{1}{5}$​ and $\frac{6}{5}$.

Write in scientific notation

The goal of this task is to write a specific number in scientific notation. You can fill in this number at the number field.

Convert units

This task is deprecated. Refer to the section on unit settings on how to convert a unit.

The goal of this task is to convert a number with a unit to another unit. You can fill in the number with its unit in the quantity field. You can fill in the final unit in the target unit field.

The goal of this task is to add a specific percentage of a certain number to that number. You can fill in the percentage at the percentage field and the number at the value field.

Percentage of

The goal of this task is to calculate the value of a certain percentage of a given number. You can fill in the requested percentage at the percentage field and the given number at the value field.

Refer to the following interactive exercise to test and inspect the behavior of the task(s).

Interactive student version:

Worked solution: