s : add: x1 to x2
- : subtract: x2 from x1
* : multiply: x1 by x2
/ : divide: x1 by x2
x2 : square: x1
x3 : cube: x1
n! : factorial of x1
x1/2 : square root of x1
1/x : inverse of x1

• Significant digits:

Enter a number at v1 box,
Enter, at v2 box, the number of significant digits required to v1,
For the result, click on the significant button.

• Rounded quantities - Linear function:

For the quantity expressed as:
X = Mx + Δx
Enter Δx at v1 box,
Enter, at v2 box, the number of significant digits required to v1,
Enter Mx at v3 box,
For the result, click on the rounding button.

Notice:

If we have a quatity V = v ± Δv, where Δv is the uncertainty of the number v,
Once Δv is rounded at certain significant digits, the number v will be rounded at the number of digits of the decimal part of Δv.

• Uncertainty - Linear function:

Fill in the boxes as shown in the above figure, and
for the result, click on the equation button.