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millimeters in a meter and 1,000 meters in a kilometer
means 1,000×1,000=1,000,000 millimeters in a kilometer), you will need
to move the decimal point 6 to the left.
74,300,0001,000,00074,300,000 mm==74.374.3 km
Next, rewrite your problem with both measurements in the same unit.

743 km ––––– 74.3 km
Now, compare the two numbers. 743 km has a digit in the hundreds
place while 74.3 does not. 743 is the bigger number. This means 743
kilometers is more than 74.3 kilometers, so 743 kilometers is more than
74,300,000 millimeters.

The answer is 743 km>74,300,000 mm.

Ordering Metric Measurements:

Sets of measurements to be placed in order, either ascending or
decsending.

We use the same steps for ordering metric measurements.

1. If necessary, convert all of the measurements so that the
measurements are all in the same unit.
2. Working from left to right, compare digits that have the same place
value. Starting with the digit on the left and moving right, whichever
number first has a larger digit is the larger number overall.