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. A decimal representation does not require a decimal point. So the required decimal representation is 3410, as in the question.
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To write 410 in scientific notation, you move the decimal point two places to the left, and indicate the power of 10. Thus, 410 in scientific notation is written as 4.1 x 10^2.
3 out of 100 written as a decimal is 0.03
3 is already written in decimal form. You could write 3.0 but that wouldn't be necessary.
3/4 is 0.75 in decimal form
To write a fraction as a decimal, do the indicated division. 3/4 = 3 divided by 4 = 0.75 To write a decimal as a percent, multiply by 100. 0.75 = 75 percent