One kilometer is =.06 miles how many kilometers would have traveled in going 42 miles?


let's have equality as:

1 km = 0.62 mi

can turn "1"
divide both sides "0.62 mi"

(1 km)/(0.62 mi) = 1

,

divide both sides 1 km

1 = (0.62 mi)/(1 km)

next: remember can multiply "1", , never changes value.

given distance 42 mi.

how turn distance in km?
multiply "1", using version km on top , mi on bottom (you want units "mi" cancel out)

42 mi = 42 mi * 1 = 42 mi * (1 km / 0.62 mi)
(the "mi" cancels out, leaving "km" on top, want)

42 mi = (42 / 0.62) km = 67.7

---------

way "1"

1 km = 0.62 mi
multiply both sides 1.6129
1.6129 km = (0.62 * 1.6129) mi
1.6129 km = 1 mi
1.6129 km/mi = 1

(the real ratio 1.609347219 km/mi)
(which corresponds approx. 0.62137 mi/km)

in real life, use 1.6 km/mi same (8/5) km/mi,
corresponding (5/8) mi/km

42 mi = 42 mi * 1 = 42 mi * (8/5) km/mi = 67.2 km

everyday uses, close enough.



Science & Mathematics Geography Next



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