The decimal notation for 113 over 400 is 0.2825
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400% = 400/100 = 4 in decimal form
Well, honey, 1 over 400 is 0.0025. To turn that into a percentage, you just move the decimal point two places to the right, giving you 0.25%. So, darling, 1 over 400 is 0.25% - not that impressive, but hey, math is math.
516,400,000 in Scientific Notation = 5.164 x 108
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
It is 400. Decimal refers to a way of representing numbers in which the place value of each digit is ten times the place value of the digit to its right. Decimal does not require a decimal point nor trailing zeros.