Question

Which of the following is true in regard to sig. figs and calculations?

1. Leading zeros are insignificant.

2. discrete numbers or those in a definition have infinite number of significant figures.

3. If the digit dropped in rounding is greater than or equal to 5 round up.

4. Trailing zeros may be significant if there is no decimal shown.

5. Round to the lowest number of significant figures when multiplying or dividing.

6. Zeros between nonzeros are not significant.

7. Round to the highest number of significant figures when adding or subtracting.