You don't convert from units to "numbers". You convert from one unit to another unit. You can convert from km to meters, to millimeters, or to some other unit of length.
It is: 820,900,000 km
555,000,000 km !
4.3 billion kilometers in full numbers is 4,300,000,000 kilometers. This is because each billion is equivalent to one thousand million, so 4.3 billion is equal to 4,300 million. Therefore, when converted to full numbers, 4.3 billion km is written as 4,300,000,000 km.
10 KM
3.570 km
0.001 km
6.75 km
There's exactly 1 kilometer in a km.
9,984,670
.008 km
1 km
0.002 km