It is 400, exactly as in the question. A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.
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Note that 400 is same as 400.0. Then, shift 2 decimal places to the left from the starting point. Therefore, the number in scientific notation is:4.0 x 102It is: 4.0*10^2
3.88 is decimal notation.
The number IS in decimal notation!
300 is already in decimal notation.
It is already in decimal notation as 4.8