Ashelf measures 1216mm long how many cm long is the shelf and how many metres long is the shelf

long.

long.

Step-by-step explanation:

In order to solve this exercise is necessary to remember that 1 meter has 100 centimeters and 1 centimeter  has 10 milimeters.

In this case you know that lenght of the shelf is 1,216 milimeters.

Then, in order to known this lenght in centimeters, you must make the conversion from milimeters to centimeters.

Knowing that:

This is:

To know the lenght of the shelf in meters, you can make the conversion from centimeters to meters.

Since:

You get:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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