## 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

This task is deprecated. Use the Accuracy settings instead.

## 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.

## Percentage add

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:**

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