How many SF in each measurement?  ·   How many SF in each calculation?  

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2.34 g  has 3 SF  

all digits (1-9) are always significant

0.7 g   has 1 SF

zeros before a decimal are not significant

3.00 g  has 3 SF

zeros after the decimal are significant

0.003 g   has 1 SF

zeros "on the left" of the significant figures are not significant

9.0 g  has 2 SF

zeros after a decimal are significant

0.0040 g   has 2 SF

zeros "on the left" of the significant figures are not significant, but the last one is

0.004560 g  has 4 SF

zeros before a decimal are not significant, but the last zero at the end of a decimal is

100%  just one SF

unless you are using it as the "idea" of a perfect score, then unlimited

1,000,000 dollars  has 1 SF

1,000,000. dollars  has 7 SF

all of the zeros before a decimal point are significant

1.0000 mL    has 5 SF

all these zeros are significant because the last one at the end of a decimal is significant, and the rest are between significant figures

15.67 mL   has 4 SF

all digits (1-9) are always significant 

1,000,001 dollars  has 7 SF

zeros between SF are always significant

3.4 mm x 2.56 mm =   

 has 2 SF

the answer is limited to the least number of SF in the math

1.00 mm x 1.000 mm =  

 has 3 SF

answers are limited to the least number of SF in the math

(6.0 g)(4.18 J/g·°C)(9°C) =  

 has just 1 SF

answers are limited to the least number of SF in the math

1758934783.0 mL  has 11 SF

zeros at the end of a decimal decimal are always significant, the rest are all digits

1758934783.00 mL  has 12 SF 

zeros at the end of a decimal decimal are always significant, zeros between SF are also always significant, the rest are digits

(1566 g)(4.18 J/g·°C)(9.5°C) = 

 has 2 SF

answers are limited to the least number of SF in the math

5 fingers on your hand  unlimited sig figs, 

unless you had to count them, which would be odd, don't ya think?

12 inches = 1 foot  

both are unlimited, they are an equality, perfectly equal to any decimal place 

1000 mL = 1 L  both have unlimited sig figs 

they are an equality, perfectly equal to any decimal place 

1.0001 g   has 5 SF

zeros between SF are always significant

1.1000 g  has 5 SF 

the zero at the end of a decimal is significant, and zeros between SF are always significant

0.000000001 g  just 1 SF 

zeros on the left are not significant unless there is a digit first

1.0010 g  has 5 SF 

zeros between SF are always significant, a zero at the end of a decimal is always significant

0.1000 g  has 4 SF 

zeros before a decimal are not significant, zeros between SF are always significant, a zero at the end of a decimal is always significant

0.0008 g  just 1 SF

zeros on the left before a decimal are not significant unless there is a digit in the front of the number

1000 km x 56.75 km =   1 SF 

answers are limited to the least number of SF in the math

5280 feet x 430 feet =  2 SF 

answers are limited to the least number of SF in the math

46. cm³  has 2 SF

both numbers are digits (1-9)

6.02 x 10²³ atoms  3 SF 

only look at the coefficient in exponents, this zero is between significant figures

(2.35 x 10¹²)(3.1 x 12⁸)  2 SF 

only look at the coefficient in exponents, answers are limited to the least number of sig figs in the math

1.0003 liters  5 SF 

zeros between significant figures are significant

6.1 g x 334 J/g =       2 SF

answers are limited to the least number of SF in the math

1.00303 moles   6 SF 

all zeros are between significant figures so all of these zeros are significant

0.00303 moles  3 SF

one zero between significant figures, the zeros on the left are not significant

This is a steel penny.  In 1943 they made pennies out of steel because copper was in high demand for World War II.  It looks silver, but it's not.  I will give you one (copper coated with zinc) later in the year, if you study hard!