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
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.004
400% = 400/100 = 4 in decimal form
Well, honey, to write four hundred thousandths in decimal form, you simply write 0.400. It's as easy as pie, darling. Just move that decimal point three places to the right and voila!
91 million 400 thousand how do you write it in standard form
400.0000.... (as many more zeroes as you want)