convertion please help....?

Question

3.9 cm=__ km? / 0.4 mm= __ cm / __m=90km / 2500mm= __ m

if you dont wanna tell me what the answer is please explain how to get the answer

Answer 1

learn the prefixes:
centi = 1/100
kilo = 1000
milli = 1/1000

thus a centimeter is 1/100 of a meter.
a kilometer is 1000 meters

there must be 100,000 centimeters in a kilometer, etc

Answer 2

The easiest way to do conversions is to look at the relationship between all of the prefixes to the base unit. The base unit in this case is the meter.

1 kilometers = 1000 m, since kilo means one thousand.
1 centimeter = 0.01m or 1 m = 100cm, since centi means 100.
1milimeter = 0.001m or 1m = 1000, since mili = 1000.

If you write out the equations with the units, you'll note when you do conversations, the units should cancel out if you do it correctly.

ex.

1.2mm =_ __ m ?

1.2 mm X ( 1 m / 1000mm) = 0.0012m , notice you're dividing mm by mm and are left with meters!

I hope this helps!

Answer 3

100 cm = 1 m = 0.001 km
1 cm = 0.01 m = 0.00001

1cm = 10 mm

So you go figure out how many to multiply by.

Cheers.

Answer 4

1. 3.9/100000

2. 0.4/10

3. 90.000 m

4. 2500/1000

Answer 5

100cm = 1m and 1000m = 1km
3.9cm = .000039km = 3.9E-5km(scientific notation)

.4mm = .04cm

90000m = 9E4 = 90km

2500mm = .0025km = 2.5E-3km