Combining Uncertainty

When combining uncertainty, the units must be.....

For uncertainty of A+B or A-B, we should:

For uncertainty of AxB or A/B, we should:

For uncertainty of A^2, we should:

For uncertainty of A^n, we should:

For uncertainty of A x number (not measured) .....

For uncertainty of A / number (not measured) .....

If we measure the thickness of 100 sheets of paper with +/-1mm uncertainty, dividing this by 100 for the thickness of 1 sheet gives the uncertainty:

A circle has the radius 0.14mm.
Find :
1. The area
2. The percentage uncertainty
3. the absolute uncertainty

How do we calculate the range?

When we repeat readings / judgments, the absolute uncertainty can be calculated by.....

When calculating the range, we should ignore.....