1. SIGNIFICANT DIGIT RULES

2. IT”S EEEAAASSSYYY!
1. All non-zero digits are significant. (1-9) Ex. 2543

3. HELP ME! I have a zero!!!!
There are only three places that a zero can be in a number – beginning, middle, or end. Here is how we know if they are significant too.
Zero at the beginning is NEVER Significant. Ex
Zero in the middle is ALWAYS Significant. Ex. 2004
Zero at the end are significant ONLY if there is a decimal. Ex and 3.00

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5. Multiplication and Dividing rules
When multiplying or dividing you look at least precise value in original data and the final answer must have the same number of significant digits.
Examples

6. Rule for addition and subtraction
When adding or subtracting you look at the number that is least precise due to place value that is in your data and your final answer must have that place value.
Examples: