# Physics Grade 11 - Significant Digits

version from 2017-09-06 20:38

## Section 1

Significant DigitNumber which represents the accuracy/precision of a tool.
How many rules for significant digits?6
Rule 1All non-zero digits are significant
Rule 2Any zero between two non-zero digits are significant
Rule 3 Any zeros to the right of a decimal & after non-zero are significant
Rule 4Any zeros to the left of first non-zero are ignored
Rule 5In scientific notation, only digits in coefficient are counted
Rule 6All zeros in counted or defined values are significant

## Math

Adding and SubtractingAnswer should be expressed using measurement with least number of decimal places
Multiply and DivideAnswer should be expressed using measurement with least number of significant digits.
Rounding DownWhen digit dropped is less than 5 * 10^[1-inf] the remaining digit is left unchanged
Rounding UpWhen digit dropped is greater than 5 * 10^[n - inf] the remaining digit is increased
Rounding with 5 * 10^[n - inf]When digit dropped is equal to 5 * 10^[]