Because the place value means, where the digit is located with respect to a decimal point. 1 is always 1, but if you place 1 in the tens place value, then the value of that 1 is 10. In the hundreds place value, the value of that 1 is 100. In the hundredths place value, then the value of that 1 is .01.
3100/100 = 31
The 1 is in the hundreds place value.
the 100,000th place value
The 1 is in the ones place.
3100
3100 is an integer which can be expressed as a fraction as 3100/1.
Because the place value means, where the digit is located with respect to a decimal point. 1 is always 1, but if you place 1 in the tens place value, then the value of that 1 is 10. In the hundreds place value, the value of that 1 is 100. In the hundredths place value, then the value of that 1 is .01.
-3100 is an integer, not a fraction. You could write it in the form of a rational fraction as -3100/1.
3100/100 = 31
1000 g = 1 kg ⇒ 3100 g = 3100 ÷ 1000 kg = 3.1 kg
Its face value is 1 but its place value is 10
% increase = 100*(3100/3000 - 1) = 3.33..%
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 3100, exactly as in the question.
3100 grams 1 kg = 1000 grams 1 gram = .001 kg
The place value of 8 = 8 * 100 = 800. The place value of 1 = 1 * 10 = 10. The place value of 2 = 2 * 1 = 2. The solution above and all other place value
The 1 is in the hundreds place value.