Which of the following is not equal to 63.7 mm?

6.37 x 104 ãƒâ‚ã‚âµm
6.37 x 10-5 km
637 cm
0.637 dm

Conversion factors, 10-2=cm, 10-1=dm, 106=km= 10-6micrometer . Moving the decimal places to the left yields positive exponent, moving to the right yields negative exponent.
63.7mm = 63.7 x10-3 m
               = 6.37 x 10-2 m= 6.37cm
               =0.637 x10-1 m= .637dm
               =6.37x10-5 m (km)= .0000637 km
               =6.37 x104 m= 6.37micrometer
63.77 mm is not equal to 637 cm but 6.37 cm or 6.37 x10-2 m. Hope this helps you.

Hydrogen is the most abundant element on the periodic table..hope it .