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hm-km-dam-m-dm-cm-mm

These are the abbreviation of the units used in length measurement

*to remember this, you can sing it in Twinkle Twinkle Little Star's tune :)

Referring to the acronym (?) (whatever you want to call it), the distance between km (kilometer) and m (meter) is 2 moves to the right (dam-m). therefore, you must move the number's decimal point 2 places to the right.

Therefore, 257,000 km = 25,700,000 m

:)

257000kmx1000m/1km ,then cancel out the unit km. then it left by 257000x1000m

=257000000m