Question

Look at all the measurements in model 4. when a number in scientific notation is changed to expanded notation, are any of the added zeros significant

Answer 1

Yes, the added zeros are significant. Lets say you are converting 1.23 x 10 to the power of 4. The answer would be 12,300 in which case, if you took away the zeros, the number would be 123, which is an incorrect answer.

Hope this makes sense and helps!

Answer 2

any number that is higher than zero is significant. zeros are significant if they are in between two other numbers and zeros at the end MUST be significant