Significant Figures Rules and Practice

You use significant figures with a measured value?

true

You use significant figures with a exact value?

false

Definition of a measured value

the numbers obtained when you measure a quantity such as your height, weight, or temperature (sig figs used)

Definition of an exact value

a number that is counted or declared (sig figs not used)

How many significant figures in: 4.5g

2 - not a zero

How many significant figures in: 122.35m

5 - not a zero

How many significant figures in: 205°C

3 - a zero between nonzero digits

How many significant figures in: 5.008kg

4 - a zero between nonzero digits

How many significant figures in: 50. L

2 - a zero at the end of a decimal number

How many significant figures in: 16.00mL

4 - a zero at the end of a decimal number

How many significant figures in: 4.8 × 10⁵

2 - in the coefficient of a number written in scientific notation

How many significant figures in: 5.70 × 10^-3

3 - in the coefficient of a number written in scientific notation

How many significant figures in: 0.0004 s

1 - at the beginning of a decimal number

How many significant figures in: 0.075 cm

2 - at the beginning of a decimal number

How many significant figures in: 850,000 cm

2 - used as a placeholder in a large number without a decimal point

How many significant figures in: 1,250,000 m

3 - used as a placeholder in a large number without a decimal point