Grade 10 · Science · Chemistry

10th grade Accuracy, precision and percent error worksheet

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Accuracy, precision and percent error

Grade 10 Science Worksheet - Challenge Me

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Circle the best answer, or write your answer on the line.

Three trials of salt's density give 2.12, 2.2 and 2.16 g/cm³. The accepted value is 2.17 g/cm³. What is the percent error of the mean, to 0.01%, Ari?
Three trials of sugar's density give 1.6, 1.62 and 1.55 g/cm³. The accepted value is 1.5805 g/cm³. What is the percent error of the mean, to 0.01%, Bo?
Three trials of water's density give 1.003, 0.995 and 1.002 g/cm³. The accepted value is 0.99802 g/cm³. What is the percent error of the mean, to 0.01%, Esme?
4.
A balance that isn't zeroed causes which kind of error, Jun?
- No error
- Random
- Systematic
5.
Readings of a thermometer wobble a little up and down each time. Which kind of error is that, Kira?
- Systematic
- Random
- A calculation slip
6.
Why doesn't averaging more trials fix a systematic error, Luz?
- Averages make errors bigger each time
- Systematic errors are random
- Every trial is shifted the same way
7.
Milo says Group 2's results must be right because they agree so closely. Agree or disagree?
- Disagree: they miss 2.17
- Agree: close results are correct
- Agree: agreement shows accuracy
8.
Noah says precise results are always accurate. Agree or disagree?
- Agree: tight groups hit the center
- Disagree: they can all be off
- Agree: precision means accuracy
9.
Pia says percent error can be found without an accepted value. Agree or disagree?
- Agree: the trials are enough
- Disagree: it needs one
- Agree: use the biggest trial
10.
One trial has a 0.1% error. What does that show about precision, Zee?
- Nothing yet: precision needs repeats
- It is very precise, as one trial shows
- It is not precise

10th grade Accuracy, precision and percent error worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Accuracy, precision and percent error. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can tell accuracy (close to the accepted value) from precision (close to each other).
I can find percent error = |measured − accepted| ÷ accepted × 100, and the mean of trials.
I can name a likely source of error in a described lab and say whether it is systematic or random.
I can say how to make a measurement more precise or more reliable.

Standard: practices (no PE)

Words to know

accuracy: How close a result is to the accepted value

precision: How close repeated results are to each other

accepted value: A trusted value from a reference, such as the CRC Handbook

systematic error: An error that shifts every reading the same way

random error: Small, unpredictable differences that scatter readings both ways

Common mistakes

Your child divided by the measured value. Percent error compares with the accepted value, so divide by that.

Your child added the trials but didn't divide. The mean is the total ÷ the number of trials.

Your child used one trial. Average the trials first, then compare the mean with the accepted value.

Questions parents ask

What is the most common mistake with accuracy, precision and percent error?

Your child divided by the measured value. Percent error compares with the accepted value, so divide by that.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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