To represent a really big or really small amount
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ther is $1000000 or you can use scientific notation.
192
0.4 The reasoning: 400 divided by 1000 is 0.4. The significant figures given in both your numbers was 1 (although it could have been more as you didn't use scientific notation so it is not possible to tell). 1 significant figure means the same should be used in the answer: 0.4. And in scientific notation: 4E-1
People in Britain use "standard form" for what people in the US call "scientific notation." 8.3 x 10^-3
The form that uses only powers of ten are logarithms to base 10. The scientific notation does use powers of ten but the original number is also used in this representation.