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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 decimal are significant

Rule 4: 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

When adding and subtracting #s you look for the least amount of decimal places

When multiplying and dividing #s you look for the least amount of decimal places
