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Waugh Sheet #1 (Modified Fall 2012)

Multiplication and Division with Significant Figures

Rules: (only one)

1.      Report your answer with the same number of SIGNIFICANT FIGURES as the number in the operation that has the LEAST number of SIGNIFICANT FIGURES.

(JUST PLUG IT INTO YOUR CALCULATOR USING THE GUIDELINES I TAUGHT YOU!)

 

Example #1:  2.80 cm  x 17.109 cm = ___?___

 

                                                        2.80    cm      (3 SIGNIFICANT DIGITS)

                                                    x 17.109 cm      (5 SIGNIFICANT DIGITS)

                                                      47.9052cm2    (You must report only 3 SIGNIFICANT DIGITS  and

                                                                                DON’T FORGET TO SQUARE YOUR UNITS)

                                                        Reported Answer = 4.79 x 101 cm2

 

 

Example #2:  7.189 x 105 pm2 / 8.9 x 104 pm = ___?___

                                         

                                                     7.189 x 105 pm2   =   0.8086614 pm  =  8.086614 x 100 pm

                                                        8.9 x 104 pm

                                                     

                                                  Reported Answer = 8.1 x 100 pm

 

Directions:  Perform the following operations and report your answers in SCIENTIFIC NOTATIONPROVE ALL work NEATLY ON A SEPARATE SHEET OF PAPER that is STAPLED TO THIS SHEET or your points are VOID. 

 

 

Problem

Answers

#1

(2.71 x 104) (2.0 x 102) =

5.4 x 106

#2

1.64 x 10-4 / 1.2 x 102 =

1.4 x 10¯6

#3

(7.07 x 10-4 x 6.51 x 10-2)  =

            2.02 x 104

2.28 x 10¯9

#4

6.4 x 3.1416 =

2.0 x 101

#5

5.92 x 7.60 x 400 / 825 =

2 x 101

#6

280 x 1023 pm3 / 800 =

4 x 1022 pm3

#7

8. 220 x 103 dm x 6.00 x 105 dm =

4.93 x 109 dm2

#8

7.893 x 105nm3 / 890 nm =

8.9 x 102 nm2

#9

12.387 x 103 fm / 1800 =

6.9 x 100 fm

#10

9.9987 x 102 dg  200 =

2 x 105 dg