Question

Indicate the number of significant figures in the following measured numbers:

a. 45 = __________​​​
f. 980.00 = __________
b. 450 = __________​​​
g. 740000 = __________
c. 0.0045 = __________​​​
h. 0.00000042 = __________
d. 3006 = __________​​​
i. 4050600 = __________
e. 0.00780 = __________​​
j. 230.0050 = __________

Answer 1

Answer: a = 2 ; f = 5 ; b = 2 ; g = 2 ; c = 2 ; h = 2 ; d = 4 ; i = 5 ; e = 3 ; j = 7

Explanation: Some rules to follow while calculating sig figs is

1. If a number like 4500 is present, only two sig figs are counted, but none of the zeros are, but if 4500. has a decimal point present, then you should count all the numbers available.

2. If a number like .0005 is present, only count 5 as a sig fig, however if the number is .00050, count the 0 after the 5 in this example (this would then have two sig figs.