Anonymous
Anonymous asked in Science & MathematicsChemistry · 10 years ago

# how do you convert this measurement of cm to km?

837498 cm to km.

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837498 cm --- any decimals in there??? What a nonsense number. Certainly not a realistic measurement. I always make it a point to give my students something that is within the realm of reality to work on.

Anyway.

837498 cm x (1 m / 100 cm) x (1 km / 1000 m) = 8.37498 cm

Why would that need to be given in scientific notation? Answer: It wouldn't. Scientific notation is useful for large and small numbers, like anything over 10,000 or less than 1/100.

Manikore wrote: "in scientific notation, that would be

8.37498 * 10^1".

NO!!!! It wouldn't. 8.37498x 10^1 is 83.7498

If you must write your answer in scientific notation then it is 8.37498 x 10^0.

That is 10 to the zero power. Anything, including 10, raised to the zero power is equal to 1. And 1 x 8.37498 = 8.37498.

=========== A bit more =============

A decimal is that little round, pointy thing. If there isn't one of those anywhere in a number, then there is no decimal point. There is an UNDERSTOOD decimal point at the end of a number, but that isn't quite the same thing as that little pointy thing.

• How pathetic the US didn't go metric. It IS a stupid number! Would you measure something as 837498 inches? Why would you measure something that big in centimetres? And no, there is no decimal point IN there - of course there's one understood to be at the end, James, that wasn't the point. Guess you were attentive in math class at least one day. How many miles is that many inches? And you can't just "move the decimal point" - it's not a decimal based system. The US is now stuck with people who can't manipulate their own antiquated system or the metric system either. Or scientific notation. It is x 10^0 km; if you insist on using x 10^5, don't forget to leave the units as cm, which will ensure your answer is incorrect - it's supposed to be km.

• well i know a km is 1000 meteres

and im just gonna think for a tad

a meter must be like 1000 cm

or no wait. its like 100 cm

so

i dunno figure it out. you basically just have to move the decimal

right?

i have no clue

sense he moved it five to the left. presuming he is right

the way im gonna remember it is you take the zeros from the 1000 and add them with the zeros from the 100 and move it that much to the left

for those that arent idiots... the guy below me is

cause theres a decimal at the end of every number

i would be ashamed to send any kid to that cause he would only make you stupider

its actually just to show people what scientific notation is you complete fool

but thats all i can handle

i dont argue with people that are so stupid it would make me look like a fool to even debate

on the plus side. even though he is a rambling idiot somewhere within his stupid nonesense he did point out how its 10 ^ 0 instead of 1 which would just move the decimal point over one more and be completely useless

im just gonna say what i think cause someone put its 10 to the power of five

but its five decimal points if your converting

10 to the power of five doesnt convert. it stays in km so thats wrong

im thinking the teacher is right

• 800 mm = 0.8 m 50 cm = 0.5 m 2.6 km = 2600 m 7 km = 7000 m 250 mm = 0.25 m 35 km = 35000 m 400 mm = 0.4 m 300 cm = 3 m 1.8 km = 1800 m cheers ;)

• Anonymous
10 years ago

James doesn't need anyone to help him look like a fool. He's doing a great job all by himself.

To convert from a lower unit to a higher unit you move the understood (LOL) decimal to the left. Move it two places for cm to m and three places for m to km. That's five places to move the decimal to the left.

8 3 7 4 9 8. cm ---> 8.3 7 4 9 8 km

..<-----------

• Anonymous
10 years ago

there are 100 cm per m

there are 1000 m per km

since a km is bigger than a cm, you would expect the number to be smaller when converted to km. so you divide instead of multiply.

837498/100/1000

=8.37498

in scientific notation, that would be

8.37498 * 10^1

• 1 Km = 1000 m

and

1 m = 100 cm

so 1 Km = 1000 x 100 => 100,000cm

1 cm = 1/100,000km

837498cm = 837498/100,000 km

therefore

837498cm = 8.37498 Km

or you can write it as

837498 x 10^-5 Km

Source(s): QN!
• Move the decimal point 5 places to the left, It's the easiest way I know there is a base ten that you can multiply to get there but this is how I Learned it

• Well, since 1km=100,000cm, 837,498cm would be 8.37498km

• (837,498cm / 100cm/m) / 1,000m/km = 8.37^3km.