How many zeroes significant figures are there in this expression 0.001050

Three zeroes are significant as 0.001050 is the same as. 001050

Also in 0.001050 you cannot change any the second and third zero so they are significant

And in between the 1 and the 5 you cannot do anything to the zero so that is significant

And the last zero can be omitted as you can add a million zeroes onto the end and nothing would happen as in a decimal only the zeroes at the start and the middle are significant