Three tools in one place. Read a cylinder to the right number of digits, count significant figures in tricky numbers, and round a calculation by the rule that fits it.
Tool 1 · read the cylinder one estimated digit, always
How finely is this cylinder marked?
Tool 3 · round a calculation type any two measurements
Raw answer from the calculator:
Properly reported answer:
Tool 2 · count the figures
48.2How many significant figures?
score 0 / 0
The rule behind it
Pick a button
Nonzero digits always count. Zeros are the tricky part, so watch where they sit.