How many significant figures are in the following numbers?

a.) 90.1

b.) 0.25

c.) 0.0601

d.) 5.00

e.) 4700

f.) 4700.

g.) 4700.00

h.) 500001

i.) 87.05

j.) 91.14200710

 a.) 3  (90.1) 

b.) 2 (0.25)

   c.) 3 (0.0601)

d.) 3 (5.00)

e.) 2 (4700)

f.) 4 (4700.)

   g.) 6 (4700.00)

  h.) 6 (500001)

i.) 4 (87.05)

           j.) 10 (91.14200710)

Round the following to the proper number of significant figures:

a.) 48.37 (to 3 SF)

b.) 0.00242 (to 2 SF)

c.) 25450 (to 3 SF)

d.) 0.67445 (to 4 SF)

e.) 47147 (to 2 SF)

a.) 48.4 (48.37)

b.) 0.0024 (0.00242)

c.) 25400 OR 2.54x 10^4 (25450)

d.) .6745 (0.67445)

e.) 47000 OR 4.7x10^4  (47147)

Add or subtract then round to proper # of SF

                                 58.91

                                + 0.587

                               ________

59.497 = 59.5

Add or subtract then round to proper # of SF

                                  0.1157

                                  +2.47

                                _________

Add or Subtract # then round to proper SF

                                   24.3

                                   -3.69

                                  ______

Add or Subtract # then round to proper SF

                                     101

                                     -9.3

                                  _______

Add or Subtract the # round to proper SF

                                89.3

                                + 5.2

                             _________

Multiply or Divide # round to proper SF

                                 0.25

                                x 8.03

                           __________

Multiply or Divide # round to proper SF

                                  6.157

                                 x7.89

                              ________

Multiply or Divide # round to proper SF

                                   78.648/5.8=

Multiply or Divide # round to proper SF

                                     0.358/7.5 =

Multiply or Divide # round to proper SF

                                     480

                                    x 1.367

                                 _________

? mi = 1.25 hr x (60.0 mi/1hr) = x (1.6093 km/1 mi) = 120.6975 km = 121 km

How many gallons of gas do you need if your car gets 24.00 miles per gallon and you need to get gas for 

a 325.0 mile trip?  If gas is $3.829 per gallon, how much did you spend on gas

? gal = 325.0 mi x (1 gal/24.0.0 mi) = 13.54 gal

? $ = 13.54 gal x ($3.829 / 1 gal) = $51.8

Your patient has a mass of 9.00 kg.  The doctor prescribes 0.250 mL of medicine for each kilogram of 

body mass.  You have a dropper that administers 0.750 mL of medicine.  How many droppers do you 

administer to your patient

? mL = 9.00 kg x (0.250  mL/ 1 kg) (1 dropper/0.750 mL) = 3.00 dropper

A train traveling at 45.0 km per hour has to make a trip of 75.0 miles  How many minutes will it take for 

the train to make the trip

? min = 75.0 mi x (1 km/ 0.6214 mi) x (1 hr/ 45.0 km) x (60 min/ 1 hr) = 161 mi

? mL = 1.50 lbs x (453.6 g/ 1 lb) x (1 cm³/ 11.4 g) = 59.7 cm³

Convert 540 nm into cm

?cm = 540 nm x (10^-9m/ 1 nm) x (1 cm/ 0.01 m) = 0.000054 cm or 5.4 x 10^-5 cm