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A decimal measurement is simply a way of representing a measurement in such a way that the place value of each digit is ten times that of the digit to its right.
It is 1 foot, exactly as in the question. Decimal refers to counting in tens: it is the way in which we normally represent numbers, with the place value of each digit being ten times the place value of the digit to its right. A decimal representation does not need a decimal point and decimal certainly does not imply the metric or SI system of measurement.
The answer depends on why you move the decimal point to the right. In the context of scientific notation, you increase the exponent by the number of place that the decimal place is moved.
There are several ways to calculate uncertainty. You can round a decimal place to the same place as an uncertainty, put the uncertainty in proper form, or calculate uncertainty from a measurement.
The number of decimal places in the product must equal the total number of decimal places in the factors. John's product should have 2 decimal places.