How many significant figures do these numbers have?

378,000 = 3sf

.00765 = 3sf

109 = 3sf

.2034 = 4sf

correct .00765 - first 2 0 after decimal not count significant .
count in number 1.00765 =this has 6 sf. not count in 0.00765

here paste copy of rules dealing significance , zero:
zeros appearing anywhere between 2 non-zero digits significant. example: 101.1203 has 7 significant figures: 1, 0, 1, 1, 2, 0 , 3.
leading zeros not significant. example, 0.00052 has 2 significant figures: 5 , 2.
trailing zeros in number containing decimal point significant. example, 12.2300 has 6 significant figures: 1, 2, 2, 3, 0 , 0. number 0.000122300 still has 6 significant figures (the zeros before 1 not significant). in addition, 120.00 has 5 significant figures since has 3 trailing zeros. convention clarifies precision of such numbers; example, if measurement precise 4 decimal places (0.0001) given 12.23 might understood 2 decimal places of precision available. stating result 12.2300 makes clear precise 4 decimal places (in case, 6 significant figures).

378,000

.00765

109

.2034

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