Sig Fig Practice
Counting, rounding, and calculations with significant figures.
Score: 0/0Streak: 0
Rules reference
- Counting: nonzero digits and zeros between them count. Leading zeros never count. Trailing zeros count only if the number has a decimal point (100. has 3, 100 has 1).
- Add / subtract: round to the fewest decimal places of any operand.
- Multiply / divide: round to the fewest significant figures of any operand.
- Combined: track the precision of each step but keep the unrounded value; round only at the end.
- Rounding: look at the dropped digits. Below half: round down. Above half (including 5 followed by any nonzero digit): round up. Exactly 5 and nothing after: round to make the last kept digit even (2.45 → 2.4, 2.35 → 2.4).
- Entering answers: type trailing zeros when they are significant (3.50). Scientific notation works: 1.2e3 or 1.2x10^3.