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Rule #1
all numbers that are not zero are significant
Rule #2
zeros in the middle of non-zero numbers are significant
Rule #3
zeros after the decimal are significant
Rule #4
any zeros and coefficients in scientific notation are significant
Rule #5
leading or beginning zeros are NOT significant
Rule #6
zeros in a large number WITHOUT a decimal are NOT significant
Adding and Subtracting
Look for the LEAST amount of DECIMAL PLACES
Multiplying and Dividing
Look for the LEAST amount of sig figs