how many significant figures do the following numbers have?

1)0.023 2) 1000 3) 8120 4) 7.991 * 10^10 5) 0.00390 6) 9.010 * 10-2
7) 9.0 * 10^-3 8) 3.4 *10*4 9) 1090.00010.
How is 1090.00010 written in scientific
notation?

1 answer

leading and trailing zeros don't count, but zeros "stuck in between" do count

so for 1) there are 3 significants
for 5) there are 4
and for 6) there are 3

I am sure you can figure out the rest

1090.00010
= 1.09 x 10^3