Grade 9 · Math · Algebra 1

9th grade Precision and greatest possible error in a measurement worksheet

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Precision and greatest possible error in a measurement

Grade 9 Math Worksheet

NameDate

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

Bo measures a table with a tape as 2.80 m, to the nearest hundredth. What is the greatest possible error?
Esme measures a trail on a map as 270 m, to the nearest 10 m. What is the greatest possible error?
Jun times a swim with a stopwatch as 31.0 s, to the nearest tenth. What is the greatest possible error?
Kira measures a crayon with a ruler as 8.4 cm, to the nearest tenth. What are the smallest and largest it could be, smallest first?
Milo measures a quilt with a tape as 2.26 m, to the nearest hundredth. What are the smallest and largest it could be, smallest first?
6.
Pia measures a pencil twice with a ruler and gets 4.5 cm and 4.50 cm. Which measurement is more precise?
- They are equally precise
- 4.5 cm
- 4.50 cm
7.
Ren weighs a coin twice on a scale and gets 8.30 g and 8.3 g. Which measurement is more precise?
- They are equally precise
- 8.3 g
- 8.30 g
8.
Zee times a race twice with a stopwatch and gets 1.05 s and 1.1 s. Which measurement is more precise?
- 1.1 s
- They are equally precise
- 1.05 s
9.
Bo measures a table with a tape as 140 cm, to the nearest 10 cm. Which of these could be the true amount?
- 143
- 155
- 128
- 148
10.
Jun weighs an egg on a scale as 45 g, to the nearest gram. Which of these could be the true amount?
- 45.8
- 44
- 46.5
- 45.3

Precision and greatest possible error. Every version has 10 questions, and the answer key prints on the second page.

I can read the smallest mark from a measurement like 3.40 m and give the greatest possible error (half of it).
I can give the smallest and largest amount a measurement could be, and the largest area or volume.
I can say which of two measurements is more precise.

Standard: N-Q.A.3

precision: How small the smallest mark of the measuring tool is.

smallest mark: The smallest unit the tool shows, like 0.1 cm.

greatest possible error: Half of the smallest mark.

to the nearest: The measurement is rounded to the smallest mark.

bounds: The smallest and largest amounts a measurement could be.

Your child named the whole-number part as the smallest mark.

Your child ignored a zero at the end of a measurement.

Your child used the whole smallest mark as the error.

Ask: what do the digits after the point tell you?

Ask: does 3.40 m tell you more than 3.4 m?

Ask: is the error half of the smallest mark or all of it?

What is the most common mistake with precision and greatest possible error in a measurement?

Your child named the whole-number part as the smallest mark.

How can I help my child with precision and greatest possible error in a measurement?

Ask: what do the digits after the point tell you?

Are these 9th grade math 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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