How Many Decimal Places? Answered.

The rules for rounding off answers are clear and obviate the need to ask the teacher.  The precision of the givens dictates the precision of the answer.

Rules for Rounding Off Answers

1.   When multiplying or dividing, round off the final result so that it has as many significant digits as the given value with the fewest number of significant digits.

2.   When adding or subtracting, round off the final result so that it has its last significant digit in the decimal place in which the least-accurate given value has its last significant digit.

3.   When taking powers or roots, round off the final result so that it has the same number of significant digits as the given value.

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