Question 753521
How to know when to divide or multiply when converting km, hm, dm, m, cm, mm etc.?
is there any specific table to convert ?! shall we multiply or divide while converting ?!
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Whenconverting, note how the units cancel out. 
Examples:
converting 24 inches to feet:
{{{24 inches(ft/12 inches)=2 ft}}}
note how inches will cancel out; whereas, if you reversed the conversion it would not.
..
converting 3 feet to inches:
{{{3 ft(12 inches/ft)=36 inches}}}
note how ft will cancel out
..
converting 1000 ft to miles
{{{1000 ft(mile/5280 ft)=(1000/5280) mile}}}≈0.189394.. mile
..
converting 0.189394.. mile to feet
{{{0.189394 (mi)(5280 ft/mi) }}}=1000 ft

etc.