Precision and greatest possible error in a measurement

Answer Key - Grade 9 Math Worksheet

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

1. 1.

   Ari measures a leaf with a ruler as 14.6 cm, to the nearest tenth. What is the greatest possible error?

   0.05
2. 2.

   Esme measures a trail on a map as 270 m, to the nearest 10 m. What is the greatest possible error?

   5
3. 3.

   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?

   2.255, 2.265
4. 4.

   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
   • 4.50 cm
   • 4.5 cm
5. 5.

   Ren weighs a coin twice on a scale and gets 8.30 g and 8.3 g. Which measurement is more precise?

   • 8.3 g
   • They are equally precise
   • 8.30 g
6. 6.

   Tala measures a crayon twice with a ruler and gets 7.25 cm and 7.3 cm. Which measurement is more precise?

   • They are equally precise
   • 7.25 cm
   • 7.3 cm
7. 7.

   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
8. 8.

   Ari measures a log with a tape as 6.5 m, to the nearest tenth. Which of these could be the true amount?

   • 6.35
   • 6.7
   • 6.53
   • 6.58
9. 9.

   Esme weighs a watermelon on a scale as 3.2 kg, to the nearest tenth. Which of these could be the true amount?

   • 3
   • 3.24
   • 3.27
   • 3.4
10. 10.

    Jun weighs an egg on a scale as 45 g, to the nearest gram. Which of these could be the true amount?

    • 44
    • 45.3
    • 45.8
    • 46.5