Sig Fig Sprint

Count, round and calculate with significant figures (sig figs). Each round has 10 questions.

How to use

  1. Pick a mode. Round 1 has the same 10 questions every time, so your class can compare scores. A Random round gives new questions.
  2. Answer, then tap Check. Read the feedback to see why.
  3. At the end, tap Show my results. Copy the items you missed onto your worksheet.
Sig fig rules reference

Which digits count?

  1. Every nonzero digit counts.
  2. Zeros between nonzero digits count.
  3. Zeros at the start (leading zeros) never count.
  4. Zeros at the end (trailing zeros) count only if the number has a decimal point.

Rounding

Keep the stated number of sig figs, starting at the first nonzero digit. If the next digit is 5 or more, round up. Otherwise leave it.

Multiply and divide

Count the sig figs in each measurement. The answer gets the fewest sig figs.

Add and subtract

Look at the decimal places in each measurement. The answer gets the fewest decimal places.