Conversion formula

The conversion factor from millimeters to decimeters is 0.01, which means that 1 millimeter is equal to 0.01 decimeters:

1 mm = 0.01 dm

To convert 900 millimeters into decimeters we have to multiply 900 by the conversion factor in order to get the length amount from millimeters to decimeters. We can also form a simple proportion to calculate the result:

1 mm → 0.01 dm

900 mm → L_(dm)

Solve the above proportion to obtain the length L in decimeters:

L_(dm) = 900 mm × 0.01 dm

L_(dm) = 9 dm

The final result is:

900 mm → 9 dm

We conclude that 900 millimeters is equivalent to 9 decimeters:

900 millimeters = 9 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.11111111111111 × 900 millimeters.

Another way is saying that 900 millimeters is equal to 1 ÷ 0.11111111111111 decimeters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that nine hundred millimeters is approximately nine decimeters:

900 mm ≅ 9 dm

An alternative is also that one decimeter is approximately zero point one one one times nine hundred millimeters.

Conversion table

millimeters to decimeters chart

For quick reference purposes, below is the conversion table you can use to convert from millimeters to decimeters