Please Excuse My Dear Aunt Sally Parentheses (P) Exponents (E) Multiply (M) Divide (D) Add (A) Subtract (S)

When counting significant figures, all digits (including zeros) are counted EXCEPT those zeros that are to the left of the number. Example: 4.3 contains 2 significant figures/digits 0.0234 contains 3 significant figures/digits 0.1100 contains 4 significant figures/digits

Rule 2: If the first digit to the right of the last significant digit is a 0, 1, 2, 3, or 4, round down by leaving the last significant digit unchanged, and dropping all the following digits. (Example rounded off to two significant digits to the right of the decimal) 45.784624 becomes 45.78 Rule 3: If the first digit to the right of the last significant digit is a 5, and there are additional digits other than 0, round up by increasing the last significant digit by one, and dropping all the following digits. (Example rounded off to two significant digits to the right of the decimal) 7.1450004 becomes 7.15 Rule 4: If the first digit to the right of the last significant digit is a 5, and there are no additional digits other than 0, round to the nearest even digit. This rule is also known as the oddeven rule for rounding off numbers. (Example rounded off to two significant digits to the right of the decimal) 7.1450000 becomes 7.14

Negative exponent Multiplication Division Power of a product Power of a power Root of a power Fractional exponents Radicals

To interpolate a value for any number in a given table X =+ X = unknown A_{m} = measured amount A_{1} = lower of the two amounts bracketing the measured amount A_{2 }= higher of the two amounts bracketing the measured amount B_{1 }= value (from table) for A_{1} B_{2 }= value (from table) for A_{2}

A whole number between 1 and 10 times the proper power of ten, also called standard form. Example: 4.30 x 10^{4}

NUMERICAL CONSTANTS (extended) 
p = 3.14159 26535 89793 23846 26433 83279 50288 41971 Î = 2.71828 18284 59045 23536 02874 71352 66249 77572

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