Sig. Fig. in math operations Multiplication and division: The answer to a multiplication or division problem cannot have more sig. fig. than the smallest number of sig. fig. in the problem. Example: X 1.02 / = 16[ =17,000 (zeros are not significant)

Sig. Fig. in math operations Addition and subtraction: A number can have at most 1 doubtful digit (except for zeros). * indicates the doubtful digit. Adding or subtracting doubtful digits involving any digit yields a doubtful digit. Round-off the answer to 1 doubtful digit. Example: 31.63* * – 1.02* = 30.61*[1*9* = 30.61

Sig. Fig. in math operations Some numbers have an infinite number of sig. fig. Examples: 12 eggs = 1 doz 1 m = 1000 mm / 5.23 = X = /2.0 = * * = – = – = Solve the following problems using scientific notation. Write the answer in correct scientific notation. 7. Calculate the number of kg in mg.