Convert 456 mm to m

1. Start with the given value in millimeters:

456 \, \text{mm}

2. Use the conversion factor:

1 \, \text{m} = 1000 \, \text{mm}

3. Divide the number of millimeters by 1000 to convert to meters:

\frac{456}{1000}

4. Perform the division:

456 \div 1000 = 0.456

So,

456 \, \text{mm} = 0.456\, \text{m}