# What is 4 5 of 5 4 ..

## Convert units with fractions

Reading time: 6 min

With the help of fractions, **Convert units** and specify sizes.

We want **Express meters in millimeters**, then we need to know the relationship:

Let's keep the following in mind:

If we now had 5 mm, then this would be:

So if we bring the meter reading to 1000ths, we can **read the millimeter value on the counter**.

Let's do another example:

"Convert m to cm."

Relationship:

Calculation:

### Conversions with time information

At the **Calculate with times** It gets interesting because tel, tel etc. do not appear here, but instead tel (seconds = minute; minutes = hour) and tel (hours = day).

As an example of a time conversion, let's take the conversion of a **quarter of an hour in minutes**:

Relationship:

By expanding the fraction, we created the denominator that expresses the minutes (one hour) required. This enables us to read the minutes we are looking for directly on the meter.

As we can see, fractions can help us when converting units.

### Unit conversion: fraction to decimal number

Here are a few examples that show conversions from a fraction to a decimal number with another unit by simply expanding the fraction:

Relationship:

Relationship:

Relationship:

### Unit conversion: decimal number to fraction

Here are a few examples that show conversions from a decimal number to a fraction in another unit.

Relationship:

Relationship:

Relationship:

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